How to Guide

Tecumseh Carburetor Diagram

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

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Four-cycle engine this symbol points out important safety instructions which if not followed could endanger the personal safety and/or property of yourself and others. Read and follow all instructions in this manual and any provided with the equipment on which this engine is used before attempting to operate your tecumseh engine. Operator's manual. TECUMSEH RECOMMENDS USING TWO CYCLE OIL PART #730227, which is a premium blend that ensures cylinder wall lubrication, mixes easy, does not separate and is specially formulated for use in air or water cooled two cycle engines. Tecumseh two cycle engines require the use of a NMMA TC-W3 or TC-WII certified oil. Automatic Login Forgotten Password.Tecumseh Enduro 16 Hp Engine Manual Diagram. TECUMSEH 8 TO 18 HP CAST IRON FOUR CYCLE ENGINES This manual covers the following models: VH80, VH100, HH80, HH100, HH120, OH120-180 Model numbers are located on the engine shroud.

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.

Tecumseh Enduro 16 Hp Engine Manual

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

Carburetor Model Type	Main Pre-set Turn	Idle Pre-set Turn
LMH	1-1/2 turn	1-1/2 turn
WHG & LME	1-1/4 turn	1-1/4 turn
LMK Fixed	1 turn	N/A

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.

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.