How to Guide

We have 3 TECUMSEH TC200 SERIES manuals available for free PDF download: Quick Reference, Technician's Handbook. Tecumseh TC200 SERIES Technician's Handbook (44 pages) TC SERIES 2-Cycle Engines. Brand: Tecumseh. Tecumseh TC 300; Tecumseh TCH 200.

Tecumseh Carburetor Diagram

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Turn screws adjusting both idle and main mixture in (clockwise) finger tight, however over tightening the screws may partially or entirely damage the tapered portion of the needle. After that, slowly back out the screws in a counterclockwise direction to the pre-set position.

Note: Some models may have fixed main jet feature characterized by the absence of adjusting screws that gives a clear indication of a fixed jet that requires no adjustment. Different types have diverse style of idle adjustments; the series 1 carburetor comes with two varying styles of adjusting needle for the idle. For air adjust system, long needle is used and for fuel adjustments the short ones are used. The adjustments for both the system are pretty much the same; however, the drops off point indicate may not be as noticeable.

Final Adjustments for MAIN

Upon starting the engine, initially allow the engine to warm up to a normal working temperature. Once the engine picks up the speed and high or fast speed has been set, it is then advisable to turn on the main mixture adjusting screw to the clockwise slowly-slowly till the point when engine begins to run inconsistent and note down carefully the position of screw at this point of time.

Repeat the same in reverse direction and now turn the adjusting screw out in counterclockwise direction until the engine reaches a point from where it begins to run in an erratic manner. Now to find out best setting point, turn screw to the clockwise direction towards midway between these two positions and that would indicate best setting point adjustment.

Set down the speed controlling carefully to the IDLE position or to the SLOW position, precisely check for an appropriate IDLE or SLOW pace RPM and at that particular point the idle mixture screw need to be adjusted and in the same way as the main mixture screw. If it is necessary, the main adjustment can be done with the engine in a loaded condition.

Caution: It has been advised to never operate the engine after removing the covers and guards. There can be some really severe injuries resulting from rotating parts. Be cautious and keep your body parts, hands, hair, clothes, and accessories at a distance from all the moving parts.

To put the engine under the load condition, carefully engage cutter deck, impeller and various other driven parts. During an event of the engine stoppage or in case engine hesitates while engaging the load, carefully set the main mixture adjustment screw out to counterclockwise 1/8 turn at a time, simultaneously testing out each and every setting with the equipment in load, awaiting this condition to be corrected.

For excessively smoking engines, (rich) turn at the time, in the clockwise direction turn the main adjustment screw, remember just 1/8 turn at one time and simultaneously test every adjustment setting done with equipment under the load, until the condition when it is corrected completely.

Gradually move the speed control to the IDLE position or the SLOW position once the main mixture is set properly. Carefully turn up idle mixture screw about 1/8 turns either in clockwise or opposing out in the cocounter-clockwise direction in case the engine is not idling properly/smoothly. Repeat it until the engine continues to idle smoothly. Reconfirm the LOW RPM and HIGH RPM settings and make adjustments as required.

RPM ADJUSTMENTS

One of the most important things to do is to ensure correct RPM adjustments. Now, as per the recommended RPM you can easily adjust the LOW and HIGH speed screws. It is also recommended to firstly identify carefully the position of LOW speed RPM as well as HIGH speed RPM adjusting screws, once done with this next step identify the corresponding HIGH and LOW RPM adjustments accordingly to microfiche card 30, the computer parts looking system or servicing bulletin #107 for rotary movers.

GOVERNED and NON-GOVERNED IDLE

While the engine is running at lowest speed bend the idle RPM tab to set governed idle at a designated RPM position. After setting governed idle, in the next step it is time to set the non-governed idle. To set the non-governed idle, push bottom part of the governor lever carefully in an opposite direction away from controlling brackets in such a manner that the throttle lever comes into contact with the idle speed screw. At this position, hold the lever and carefully turn the idle adjusting screw in clockwise direction to increase or in counterclockwise direction to decrease the engine idling speed. Make sure that the setting of carburetor screw must be set either 600 RPM below the tab or at the governed idle setting.

4 CYCLE WALBRO CARBURETOR PRE-SET AND ADJUSTMENTS

MAIN AND IDLE PRE-SETS ADJUSTMENTS

Carefully turn both the main screw as well as idle mixture adjusting screws to clockwise direction finger tight. Be careful while tightening the screws as over-tightening may lead to damage of the tapered portion of needle. Now turn back the both the screws out counterclockwise into pre-set figure as shown in the chart. Correct fuel and air mixture is necessary for smooth performance of the engine.

[For the Carburetors with no adjusting screw indicate a fixed jet type and in such cases no adjustment is needed]

SOME FINAL ADJUSTMENTS

Upon starting the engine let it to warm up for 5 minutes till the point a normal operating temperature has been reached. Upon reaching the normal operating temperature, set carefully the speed control position at HIGH or FAST, and then until the point when engine begins to run erratic (lean), repeatedly keep on turning the main mixture adjusting screw slowly in clockwise direction. Make sure that you note carefully position of the screw at this point. Now repeat the same in counterclockwise direction, and turn the screw out in counterclockwise direction up to the point where engine begins to run erratic (rich). After taking both the values, now turn the screw back towards the clockwise direction to position the screw in midway between these two adjustment positions and this point is considered as the best setting.

Tecumseh Tc300 Manual Instructions

For smooth functioning, set the speed control carefully to either SLOW position or IDLE position and make idle mixture screw adjustments in the similar way as the main mixture screw.

Now you can easily set the HIGH speed and LOW speed governor adjusting screws according to the recommended RPM’s. It has been advised to firstly identify the positions of both LOW speed and HIGH speed governor adjusting screws. After identifying these values, identify the standard HIGH and LOW RPM settings as recommended according to microfiche card 30.

In case if further adjustments are needed, then main adjustments must be made under the loaded conditions. Make sure that engine is never operated with covers or guards removed as the rotating parts of the engine can cause some severe injury.

To put the engine under load conditions, make sure all the driven equipments like cutter deck, impeller, etc. are engaged properly.

During an event of the engine stoppage or in case if engine hesitates while engaging the load (lean), it is advised to turn the main mixture screws used for adjusting out in a counterclockwise direction about 1/8 turn at a time and simultaneously testing each setting position with the equipment under load until this condition is corrected.

During an event of excessive smoke from the engine (rich), the main adjusting screws need to be turned on in (clockwise direction) 1/8 turn at a time, simultaneously testing each and every setting positions with the equipment under load to the point until this excessive smoke condition is corrected.

Carefully move the speed controls towards the IDLE or SLOW position, once the main mixture is set. Turn the idle mixture screw to 1/8 turn either in the clockwise direction or out into counterclockwise direction in the case if engine is not idling up to the point where engine starts to idle smoothly.

Check your settings for HIGH and LOW RPM again and make adjustments if necessary. All of the above mentioned fuel, RPM and idle adjustments are necessary. You must follow them religiously and keep your engine in a pristine condition for a longer period of time.

PRE-SETS AND ADJUSTMENTS OF WALBRO CARBURETORS 2-CYCLE

IDLE PRE-SET

To allow the engine to get started allowing the carburetor to be fine tuned, turn the idle mixture adjusting screw into clockwise direction finger tight, closed to the position, and then turn the screw into counterclockwise direction following chart above.

FINAL ADJUSTMENTS

Idle Mixture: Upon the start, for first 3-5 minutes, allow the engine to reach a normaloperating temperature. It is advised that only once the engine reaches normal operating temperature, begin swiftly with turning idle mixture screw in clockwise direction. The engine would start to falter as soon you turn it towards clockwise direction. Such a situation is termed as the lean drop off point.

NOTE: As soon as the RPM exceeds 2,400, immediately stop the procedure for a while and diminish the idle RPM. Make sure that RPM does not exceed above 2,400 as this may cause the fuel from main jet to supply to the idle mixture that may lead to an unbalanced idle mixing settings. Turn the needle out till the point engine starts faltering. Make a note of this particular position, this is known as the rich drop-off. The final useful needle setting lies somewhere halfway between the lean drop-off points and rich points. Once this mixture is set, there is also a need to adjust idle speed that need to be set as per the recommended RPM.

WALBRO CARBURETORS 4-CYCLE FIXED (WHG) (OH120 – 180)

There are certain occasions where high altitude may affect the operation of high and low speed performance. In order to correct such kind of situations following steps may be used efficiently:

• Try to remove the air cleaner assembly.
• Choke shaft assembly removal.
• Remove the brass cup shaped plug out of the nozzle well vent using an ice pick type of tool with a small hook placed at the end.
• Reassembling the choke shaft assembly.
• Reinstalling the air cleaning assembly.

NOTE

To prevent chips entry into the carburetor make sure no thread taps are used.

CARBURETOR CLEANING SERIES 8-11

1 Carefully remove bowl and after removing it push the float hinge pin out with the carbtool part # 670377. remember that the float can’t be rotated in upward direction.

2 Using the carb tool, remove the seat.

3 Insert the carb tool gently to remove the emulsion tube. Until you successfully locate the air bleed passage, keep on rotating the hook. Then pull the tube outwards keeping the hook in place.

4 Better remember there are 2 “O” rings present on the emulsion tube. To successfully remove the upper second “O” ring you might have to enter into the center leg for a second time.

5 Using a sharpened chisel carefully remove the extended prime well welch plug. Pound close to the red primer bulb side while piercing through the extended prime well welch plug, as not to mar the casting.

6 Extendable prime well w/.012″ tag wire needs to be cleaned carefully. Also there is a need to clean carb spray as well.

7 Remove the idle prime well welch plug making use of a sharpened chisel or even a punch can be used. Using a tag wire as well as a carb spray, efficiently clean the progressive holes along with the idle air bleed hole. During an event of damage in the progression holes, make sure to replace with a new carburetor.

8 Remove carefully the idle restrictor cap, using the tag wire and carb spray clean the idle jet.

9 Using tag wire, clean the idle circuit fuel pick-up that is located in the center leg.

10 On the side of the center leg, Series 11 bridge carburetor incorporates an additional idle circuit fuel pick-up jet that needs to be cleaned using .012″ (.3 mm) tag wire.

11 Using tag wire, clean the main jet (bowl nut). Mainly there are 3 drilled passages, the idle delivery hole, the fuel pick-up and the main jet.

12 Using TecumsehPower carburetor spray part # 696410, spray all the cavities.

13 With a flat punch, replace the welch plugs that are included in the carb kit. Cover theedge where plug is meeting the casting with fingernail polish.

14 A seat having a grooved end is installed firstly into the carburetor casting.

15 Make sure that you carefully install seat into the orifice using the carb tool until itbottoms well on the casting.

16 Using the carb tool check out the float height. The float should be placed in such a way that on carb tool removal, the float must remain on its position. 11/64″ is the dimension of the carb tool.

17 By bending the metal tang carefully adjust the float if needed.

18 Before inserting the float hinge pin bring the float/needle assembly down into the position.

It is worth to mention that one should always keep in mind that the open end of the needle clip of a TecumsehPower carburetor would always face out towards the air cleaner side.

19 Install a new float bowl, bowl “O” ring, and the bowl nut with a new bowl nut gasket.

PROCEDURE FOR FLOAT ADJUSTMENT

SETTING FLOAT HEIGHT

TecumsehPower tool parts number (670377) or the 11/64″ drill bit are necessary for proper setting of the float. The float height setting procedure is as follows. Firstly remove carefully the bowl gasket, now in inverted position hold the carburetor. In a direction parallel and opposite to the float hinge pin, place carefully the tool across the carburetor body. By bending the tab on the float adjust the float height until the tab touches.

SERVICE TIPS FOR CARBURETOR

SERVICING THE SEAT

Making use of the removable seats made out of VITON^® material, TecumsehPower carburetors are built. By using TecumsehPower tool 670377 these seats can easily be removed or these may also be removed by bending the wire with a hook measuring 3/32″ or bending the end of a paper clip. Now, very carefully try to thrust through the hole towards the center of the seat and then remove it. Make sure you always use a new seat for the replacement purpose and never reuse an old seat.

Before installing a new seat, be sure whether the seat cavity is clean or not, if it’s not clean make sure you properly clean it and to help it slide into the place moisten the seat using a drop of oil. With the grooved side of the seal down position the seat and with a 5/32″ flat punch carefully push the seat into its cavity to the point where it bottoms out. This job can also be performed efficiently using the TecumsehPower tool 670377.

INLET NEEDLE & FLOAT INSTALLATION

Float and the inlet needle needs to be reinstalled into the carburetor. It is also important that the long end on the inlet needle of the clip should be pointing toward the air intake (choke) side of the carburetor.

THE FLOAT BOWL INSTALLATION

By carefully placing the detent portion in a direction opposite of the hinge pin the float bowl can be installed. The deepest end of the bowl needs to be placed in a position exactly opposite to the inlet needle. Located in the deepest part there is a dimple in the bowl. The dimple serves the purpose of minimizing the chances of the float that may at times stick to the bottom of the bowl that is mainy caused by stale fuel.

FLOAT BOWL SERVICE – VECTOR AND SERIES 7

For float removal purpose, using a needle nose pliers carefully grasp the cross piece lying somewhere between the center leg as well as the pivotal point on the float. It is very important to pull out the float straight out in such a manner that it does not break. While installing the float, into the hinge slot present on the float place the float hinge pin and slowly press into place in the bowl.

In order to hold the seat in the place, there may be few types of bowls that may also contain a clip or retaining ring. This feature may come pre-installed as needed for the manufacturing process.

In order to make the process of assembly easy, on the gasket and the bowl an alignment notch is also placed that would guarantee a proper location for the gasket.

MAIN MIXTURE SCREW ASSEMBLY

Carefully position the coil spring on the screw first which is then followed by the small brass washers and finally the rubber “O” ring seal while you reassembling the main mixture screw used for adjusting.

WELCH PLUGS REMOVAL AND INSTALLATION

All the welch plugs must be removed in order to expose the drilled passages to facilitate proper cleaning. Sharpen to wedge point a small chisel in order to remove the welch plug. Carefully drive chisel inside the welch plug and then push down on chisel to out of the position.

As illustrated, a new welch plug must be installed bell-up. Tap down on to the plug using a punch that is equal or greater than actual size of the plug. Make sure that the dent must not drive to the center of the plug below or to the top surface of the carburetor. Since the nail polish offers resistance towards the fuel, nail polish can be used to seal the outside edge of the plug with nail polish after installation of the welch plug, in order to ensure that no air would enter the mixing well, as a result leakage of the fuel can be avoided. For the purpose of identification, you can use different colors so that the work of the previous repair person can easily be identified.

FUEL INLET FITTING
Fuel inlet fitting can easily be removed by the means of twisting and pulling, if necessary. Make sure that you install it in the same position as that of the original one. As an integral part of the fitting strainer might be a part of some diaphragm carburetors. Replace the fittings if the strainer is not possible to be cleaned or lacquered. Carefully insert the tip inside the carburetor body while installing a fitting. Using a Loctite grade A coat the exposed portion of the shank and press it in until the shoulders come in contact with the carburetor body.

REMOVING INLET FITTING
A 1/4″ bolt, 1/4″ nut as well as a washer 1/4″, coupled with a 1/2” nut can successfully be used to remove the leaking or damaged fuel inlet fitting. To successfully remove plastic part of inlet fitting, a plier or vise can efficiently be used. Using a 1/4″-20 tap, you can tap the inside of the remaining metal portion of the fitting. To properly guide one side of the nut to position it squarely to the carburetor you need to place a 1/2” nut over the fuel fitting. Next step, thread the 1/4″ nut on to the bolt up to the point until it comes in contact with the shank, then add the washer, and carefully thread the bolt into the fitting until snug. Up to the point where the fitting is removed, tighten the 1/4″-20 nut.

PROPER INSTALLATION OF THROTTLE PLATES AND CHOKE ON THE Tecumseh CARBURETOR

First of all on the air horn of the carburetor, place the choke plate. It is very important that the flat surface must face downwards. Each carburetor as designed to operate, can operate only in one way, however the choke plates can operate in both directions also. Make sure these choke plates are assembled properly to operate in right direction for your engine.

NOTE: While reinstallation of choke or a throttle shutter, always use a new screw(s). Old screw(s) must never be reused.

THROTTLE PLATE SERVICE

The plate with scribe mark needs to be positioned facing out and in the 12 o’clock position while installing the throttle plate on the 2 – 7 hp carburetors.

NOTE: One thing that needs to be taken care of is that the binding must not occur.

Position carefully the plate with scribe mark in a direction facing out and in the 3 o’clock position while installing the throttling plate on the 8 – 17 hp carburetors.

NOTE: Important to note that in carburetors binding must not occur.

DIAPHRAGM CARBURETOR “F” DESIGNATION
For all the carburetors having an “F” designation on the casting, the installation sequences same as the gasket and diaphragm on the carburetor will be identified. For all the carburetors designated as “F” carburetors the diaphragm needs to be installed first then the gasket and cover in the end. In case if there is no designation mentioned, then the general sequence of installation is the gasket, diaphragm and cover in the end.

SERVICEABLE EMULSION TUBES
There are some carburetors making use of a serviceable emulsion tube that is sealed with “O” rings on one or both the ends. There rings on the emulsion need to be removed while servicing these carburetors. It has been witnessed quite commonly that during the process of the tube removal the “O” ring on the venturi end of tube at times may remain stuck in the central leg of the carburetor. In order to guarantee proper operation and sealing this “O” ring must be removed and replaced back. The tube bends a 90o hook in a paper clip or stiff wire to remove. Reach inside the venturi and try to push out the main nozzle emulsion tube as far as possible. Try to Hook the wire inside the air bleeding hole and carefully pull out to remove. Make sure that before reinstalling the tube, all “O” rings have successfully been removed and placed back on the main nozzle emulsion tube.

SERIES 7 CARBURETOR AND VECTOR EMULSION TUBE SPRING

To put tension on the tube in order to force it towards the gasket, an emulsion tube spring in the Vector as well as Series 7 carburetor can successfully be used. This can be efficiently used to seal the tubes thereby to prevent inflow of any unmetered air into the center leg. The proper series can be firstly float bowl then the spring, the tube, gasket and towards end is the carburetor body. The emulson tube can be removed by gently grabbing the tube with a needle nose plier and pulling it out straight. Replace the tube in case if it is distorted or damaged.

HOT RESTART

Occasionally, on the dual system carburetor equipped engines, some rich starting conditions may have occurred at times when the engine is warm. Using the white plastic spacer this can efficiently be corrected as shown and at the same time inserted in to the center leg of the carburetor. (Service # 632158). To reduce considerably the amount of prime charge into main nozzle area this spacer has been designed for a better starting under the warm engine conditions. It doesn’t lean out the carburetor mixture and can only be used on Dual System carburetors.

PRIMER BULB SERVICE

IDENTIFICATION OF A PRIMER BULB

One must replace carburetor primer bulbs with care. Hard starting or non-starting problems can be caused on the usage of the wrong primer bulb. Currently, TecumsehPower makes use of four different carburetor mounted primer bulbs. Use the Master Parts Manual to avoid problems during the correct application.

The primer bulbs five in number currently makes use to feature two different shapes; derby and stepped (or hourglass) and similarly two different venting types; internal as well as external.

STEPPED PRIMER BULBS

In order to force easily a charge of air directly into the bowl through the atmospheric vent chamber stepped primer bulb can efficiently be used. The sealing surfaces as pictured prevent this air from going back into the air filter.

NOTE: A Bowl prime system needs a great gasket seal on the bowl or otherwise a low prime charge might be generated.

Caution: While removing retainer, in order to avoid serious eye injuries, it is important to wear safety glasses or goggles.

Grasp the bulb with a plier to remove the primer bulb by twisting and pulling it out of the body. The retaining ring must be removed out after after removing the primer bulb. A screwdriver must be used to carefully pry the retainer out of the body. Old primer bulb or retainer must not be reused.

It is necessary to clean the primer passages thoroughly once the primer bulb has been removed.

Using a deep reach socket, press the new bulb as well as retainer into the position

NOTE: New primer bulbs always come with a new retaining ring.

Tecumseh Carburetor

Tecumseh Carburetors

Welcome to this site where you will find information on Tecumseh Carburetor, who supply products like lawn mowers, garden tractors, snow throwers, tillers and other outdoor power equipments. They have been in this business since 1934. Raymond Herrick who started the company was a very well qualified, skilled and experienced machinist who has also worked with Henry Ford.

He gathered all the knowledge of the assembly line. In 2007 Tecumseh Products Company sold the Tecumseh Power engine manufacturing division to Platinum Equity LLC who sold the parts rights to Certified Parts Corporation in 2009. Since 2008 only OEM (original equipment manufacturer) Tecumseh parts are still available for purchase bearing the Tecumseh brand name. This site offers all information on the Tecumseh Carburetor to help you solve any problems you may have.

If you are looking for information about such products and equipments you have come to the right place. Below, you will find the required information about each carburetor that Tecumseh ever manufactured. This information will help you to distinguish between each model. Not only Tecumseh, we also provide information about many other carburetor. Our main aim is to ensure consistent flow of information about Tecumseh small engines and the related carburetors.

How to Identify a Tecumseh Carburetor Parts:

To identify the right Carburetor it is important to know all the distinguished facts and features of Tecumseh so that you can separate best from the rest.

First series of Carburetors includes Dual System Carburetors

With a large prime bulb placed on side of the carburetor Tecumseh dual system puts into use best 4-cycle crankshaft rotary mower.

Series 1 Carburetor

There are a variety of styles that are easily available in this category. Series 1 comes in both the 2 cycle and 4 cycle variants with vertical and horizontal shaft engines that ranges from 2 to 4 Horse Power range. As compared to series 3 and series 4 these have a smaller venturi.

Available in float style a distinguished fact which set apart this series from all other variants is the provision of an adjustable idle in some models and main while remaining has a similar fixed main provided with an easy to adjustable idle. The application with fixed speed comes only with fixed main system whereas the drill option remains unavailable in the idle system. If you are using this carburetor after a long time, then make sure that it is cleaned with a high quality and recommended cleaner so that dust and varnish can be removed.

Series 1 Emission

Similar to standard series 1 carburetor, the emission equivalent in this series has a fixed idle as well as main. When it is in use, the cap on idle restrictor jet is removed otherwise it remains on whole time. For identification purpose you can easily look for the fixed main jet that is a part of bowl nut in the model. Aball plug seals the passage and is easily visible from the bottom. Another added feature of this carburetor includes serviceable main nozzle emulsion tube.

Series 2 Carburetors

Mainly used for on outboards engines, series 2 are yet another entry into the list of carburetors. As compared to series 1 these are quite similar with only difference being that it comes with a remotely adjust idle mix screw along with an in built fuel pump.

Inside the fuel pump, element alternately inflates and then deflates with the pulsations of crankcase that would alternately open and close the flap valves inside. During installation of the fuel pump’s element, it is really important to take care of the slop opening angle that must be somewhere around 45 degrees for proper installation. It has been observed that deviation from this angle can damage the diaphragm.

Series 3 and Series 4 carburetors

Mainly used on 8 through 12.5 horsepower in 4-cycle engines in these carburetors, the venturi size is bigger than that of series 1 and dual system carburetors. Identification mark is the presence of bosses, symbolic on each side of an idle mixture screw.

Series 3 and Series 4 Emission

Series 3 and 4 come with really delicate piece of distinction and these generally come with emission equivalent that has a fixed idle as well as main. The idle restrictor of these carburetor comes with a cap that is removed as soon as the machine comes in use. Few features like fixed main jet along with bowl nut, Aball plug as well as serviceable main nozzle emulsion tube remains same as in the series 1 emission.

Tecumseh Tc300 Manual Diagram

The major point of difference among series 3 and series 4 lies on the fact that in series 3 one screw is on the throttle and choke plates whereas series 4 comes with two screws on throttle as well as choke plates.

Vector Carburetors

A Vector Carburetor is a non-adjustable float feed having 1 piece extruded metallic aluminum body. All the components of these type of carburetors like float bowl, fuel bowl, needle, float, nozzle and venturi , seat and nozzle emulsion tube can easily be serviced without any need to remove the entire carburetor body out from the engine.

Series 6 carburetors – 4 Cycle

This series of carburetors comes with each 2 and 4-cycle engines. As compared to dual system carburetors, their venturi is comparatively larger and these make uses of a simple idle system. With all nonadjustable variants, their 4 cycle version comes with a provision of a stepped primer bulb.

Series 6 carburetors 2-cycle

Mainly used on TVS/TVXL840 engines series 6 are quite similar in looks as well as the operation mechanism of the carburetors mainly used in case of 4 cycle engines. However few basic difference points are:

1 Identified by a typical L stamp present on the nut, the bowl nut is on left hand thread.

2 In order to reduce erratic float travel, there is a provision of a damping spring that is set up on a float hinge pin.

3 The two mounting bosses that extend outwards from body of the carburetor.

Series 7 carburetor (Emission)

Mainly put to use in case of medium sized frame overhead valve engines with a vertical shaft, series 7 forms efficient emission grade carburetor. Tecumseh series 7 carburetor parts comes with mounted main as well as idle jets that are ideally placed within the bowl of the carburetor. Basically all the parts can be serviced without any need to remove whole carburetor body out of the engine.

Series 8 (Emission)

Series 8 comes with both mounted as well as main idle circuit. By means of a restrictor jet, the fixed idle setup has been made possible. Alike all the other series a models Cap feature on idle restrictor jet can also be traced down in this model. Additionally, these types also include the feature of being able to service the main nozzle within the emulsion tube along with a stepped primer bulb.

Series 9 Carburetor

Tecumseh carburetor series 9 is an associated emission that makes use of identical carburetor body as that in the case of series 8 however with a common mounted idle system that is identical to the one used in the case of series 6. A unique feature of these series includes a discharge port that is ideally located exactly at the 7 ‘o’ clock position on the throttle ending of that particular carburetor.

This series can easily be identified by the unique ability to service the main nozzle within the emulsion tube, stepped primer bulb and the provision of a non-drilled idle inter mixture well. These unique feature makes this carburetor different from others.

Series 10 (Emission)

With a great similarity to series 8, the series 10 has a slight difference with just an addition of choke. A fixed idle main feature is also been provided to assist easy start during cold weather.

Series 11

Series 11 has a provision of fuel chamber, assembled to the carburetor from where fuel is fed into the venture throughout the starting warm up period. The feature has been introduced mainly to eliminate surging, hunting, and false starts and has proven out to be of quite a use in eliminating these. A black restrictor cap can easily be used for the identification purpose. The gray is 640053 whereas640200 is part number.

Series 11 Bridged

These are almost identical with series 11 carburetor and an exception of the center leg.

Carburetor Cleansing Series 11 and Series 11 Bridged

One of the most striking features includes the metering jet that can easily be seen upon fuel well removal but Welch plug is a non-serviceable portion. Most likely preference had always been to soak a carburetor not more than half an hour but series 11 is the exception. For safe working, it is important to service all Tecumseh Power carburetors keeping in mind carburetor safety # 696410 making use of a .012’’ (.304 mm) gauge wire.

Tecumseh Carburetors Adjustment:

Dellorto Carburetor

These types of carburetors possess a great similarity with the dual system carburetor. It’s no adjustments offers a primer assisted starting, a non corroding float with a viton tipped needle. The fuel inlet angle is completely adjustable. Fuel inlet angle is connected to the body of carburetor making use of a banjo bolt. Most common use of these series is found in TVS rotary lawnmower engines.

Walbro LMK Carburetor

Tecumseh Tc300 Service Manual

These come with a fixed main, bigger venturi along with an idle that can easily be adjusted. Few outstanding features includes a non-metallic choke shaft, non corroding float and a very useful viton tipped needle. Walbro name can easily be found on the body of carburetor and founds application on plenty of OHV engines.

Walbro WHG Carburetor

With an option of easy to be designed on fully easy to adjust, single adjust or non- adjustable carburetor these comes with a large venturi. One of the best features to recognize these types are the large square mountings surface that can be located on the choke end. Best application is its use on OH cast iron engines.

Diaphragm Carburetors:

One of the striking features of this type is that as compared to float style carburetors, diaphragm can easily be operated at even severe angles. These type of carburetors lack fuel bowl and need fuel supply to be situated at a position from where it can be gravity fed. Moreover, you need to make sure that high quality synthetic fuel is used. This will help you to get optimum performance as well as smooth working of the engine.

Tecumseh Tc300 Engine

WTA Walbro Carburetor

These have a distinguished rubber type diaphragm that remains open to atmospheric pressure on one side and intake pressure on the other. On TC200 and 300 engines WTA is put to use. Additional features include a choke with a complete metal fuel inlet fit.

WT Walbro Carburetor

Tecumseh Tc300 Manual

The WT Walbro put to use mainly for TC-II type of carburetor. This type of carburetor comes with no choke lever and also has a combining plastic along with metal fuel inlet fitting.

Tillotson HU Carburetor

Mainly used in the case of TC-II. It can comes with a main that can easily be replaced and an easily visible Tillotson on the pump cover.

Tecumseh Power TC Carburetor

These comes with a fixed idle along with a main that easily meets all the emission standards of two cycle engines. Serviceable main jet is easily accessible after removing the plastic cap. As a compliance with the emission regulations, the jet must be covered after cleaning. If not covered after cleaning, external moisture and dirt can cause the carburetor to stop functioning and the engine will also become inactive.

Conclusion

The information is quite useful for all your future reference related to carburetors and information can easily be used to enhance you knowledge as well. It has been advised that users must not repair any Tecumseh part on own and refer to the user manual provided with the product. In case you need some serious help, refer to the warranty at dealer of shipping company. These are the best suited carburetors based on quality as well as price.