carburator adjustment


Old 12-04-01, 02:22 PM
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carburator adjustment

how do you adj. a tecumshe carb. on a 3.5 horsepower snow blower?
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Old 12-04-01, 02:51 PM
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Hello and Welcome ealcaraz41 to our Do-It-Yourself Web Site and my Small Engine forum.

Without knowing what type of carb it is, it's difficult to exactly say. Not knowing why the carb would need an adjustment makes it more difficult.

If we knew what the engine was doing or not doing while it was running, if it is running or not, would also be an advantage. The engines problem symptoms may not be carb related.

However, below are some basic proceedures. With the information provide below, carb adjusting shouldn't be a problem, providing the carb is okay and is the problem.

Most likely cause for an engine to be hard starting, running rough, backfiring, accelerating poorly, running hot, stalling at idle, dying out at top speed, etc. is a fuel mixture set too lean.

If your machine is experiencing any of the above engine problems, try riching the fuel mixture for both low speed and high speed. About an 1/8 of a turn counterclock wise on the left {L} fuel screw and 1/4 turn out on the right screw {H}

Ideal fuel mixture is a mid point between too much fuel {Black Exhaust Smoke} and too little. Too little is when the engine just starts to die. The mid point between the two is ideal. Just slightly rich {1/8 turn out} is okay too.

For carbs with two adjustment screws, the screw marked "L" is the low speed fuel mixture screw. The screw marked "H" is the high speed fuel mixture screw. Both adjustment settings must be correctly set to avoid hot or lean running problems.

Incorrectly set low speed fuel adjustments {lean} will cause rough idling, stalling and acceleration problems. Incorrectly set high speed adjustments {lean} will cause excessive engine heat, poor performance and a lack of power, etc.

Regards and Good Luck,
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