How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Curtis B. Your Own Question
Curtis B.
Curtis B., Technician
Category: Small Engine
Satisfied Customers: 26057
Experience:  have worked on and around most engine models for 35 yrs./Polaris ATV expert
30244710
Type Your Small Engine Question Here...
Curtis B. is online now
A new question is answered every 9 seconds

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: 22 days ago.
Category: Small Engine
Expert:  Curtis B. replied 22 days 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 22 days 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 19 days ago.

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

Related Small Engine Questions