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Curtis B.
Curtis B., Technician
Category: Small Engine
Satisfied Customers: 27444
Experience:  have worked on and around most engine models for 35 yrs./Polaris ATV expert
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I have an Onan GT 20 twin garden tractor that when the

Customer Question

I have an Onan GT 20 twin garden tractor that when the engine is running, it surges and I can,t get it to stop. Last summer I replaced the carberator
JA: Can you guesstimate how old the engine is? And has it done anything like this in the past?
Customer: the engine is 8 years old, and the surging started last summer
JA: Do you plan on doing the work yourself?
Customer: I can, there is not a shop around the area that wants to touch a Onan any more
JA: Anything else we should know to help you best?
Customer: I wonder if the governor could be the problem.
Submitted: 6 months ago.
Category: Small Engine
Expert:  Curtis B. replied 6 months ago.

Welcome to JUST ANSWER small engines, let me try to help you !! I don't know it all, but maybe together we can get you a satisfactory answer!

Expert:  Curtis B. replied 6 months ago.

I doubt the governor is causing the surge. Have you ran a cylinder test? Loosen the spark plug wires, and with engine idling, remove one wire at a time. Engine should continue to run. If it dies when wire is removed, the opposite cylinder is not firing! Missfiring/surging can be bad coil, bad spark plug or the valves need to be adjusted.

Expert:  Curtis B. replied 6 months ago.

I see the question is still open, did you run the cylinder test? Result?

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