Troy Bilt sickle mower carburettor

LADY>TIGGER said:
Hi,
I have a T B Sickle Mower that surges all the time, and now wont increase its Rev's, model is the 34337, 4hp, cleaned the carb twice, still not right, probably need a new carb.
E/Bay research suggests that the carb that will do the job is 6150 650 series, the question is will it fit and do the job.
regards to all. Mike
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Surging is almost ALWAYS related to the Governor. Springs are very temperamental. There’s a reason there are so many different holes in the Governor arm to hook the spring to. I move the spring, one hole at a time and run it until the surging stops. Some motors have a “bendable” arm that you can tweak a little with a needle nose. Hope it helps.
 
laurin800 said:
Surging is almost ALWAYS related to the Governor. Springs are very temperamental. There’s a reason there are so many different holes in the Governor arm to hook the spring to. I move the spring, one hole at a time and run it until the surging stops. Some motors have a “bendable” arm that you can tweak a little with a needle nose. Hope it helps.
Click to expand...
Many of us mechanics will probably disagree. I personally know there is several things beside the springs that can cause surging. For me it is a lot of the time a fuel mixture problem or linkage wear.
 
One more thought. I have heard that "some" carb manufacturers place a "filter" or screen inside the fuel inlet. Therer could be a hidden obstruction inside the inlet for fuel. Just reverse air pressure or carb clean to clean..
 
Fuel tank is not venting. The 5 minute run is about what a full float bowl would give. I think the carb is ok and you have an obstruction in the fuel tank to carb. be sure to check the fuel tank for a filter as well. try running with an alternate fuel source.
 
Surging on a governed engine is because there is insufficient fuel to maintain a constant speed .
IT is not CAUSED by the governor
It PROVES that the governor is working as it should
A wrong governor spring or spring in the wrong hole does nothing more than change the engine speed
 
Have your carb cleaned by ultrasonic, “swishing, blowing, using a wire” does nothing with today’s crap fuel!
 
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