On The Onan Generators carburetors there are three adjustments. There is one that sets the governor and the other is the ideal speed jets.Then there is the one in the back with the big wheel. How do I adjust this one? What doe's it control? I am trying to stop the surging. Thanks

Surging is usually caused a dirty carburetor. The first thing to do is clean the carb before trying to adjust anything. If it was running well in the past but now surges then it is most likely gummed up carb.Model number would help so that someone with a Repair manual for your model can advise you.

I have been trying to stop the surging on my Onan for a year now. Removed the carb and cleaned the main jet to no avail. Finely broke down and found a new carb on ebay for $230 free shipping and installed it. Runs great now with no surging. Now if I can only remember to run the thing every month so it doesn't clog up again is another question.

darsben1 wrote:Surging is usually caused a dirty carburetor. The first thing to do is clean the carb before trying to adjust anything. If it was running well in the past but now surges then it is most likely gummed up carb.Model number would help so that someone with a Repair manual for your model can advise you.THE ENGINE SURGED ALL THE TIME NO LOAD OR HEAVY LOAD. I REMOVED THE CARB CLEANED IT NOW IT RUNS GREAT WITH NO LOAD AND WITH LIGHT LOAD (RUNNING A FAN OR THE TWO FANS ON THE A/C). Try to run the the A/C or a vacuum cleaner and it starts surging.

It has idle jets and main jets.

Chris Bryant wrote:It has idle jets and main jets.The "big" wheel is the MAIN jet adjustment. The Idle is on the side. Doug

Onan Carb adjustments | Good Sam Community

12 Replies

DennisVR
Explorer
Aug 06, 2017
I have been trying to stop the surging on my Onan for a year now. Removed the carb and cleaned the main jet to no avail. Finely broke down and found a new carb on ebay for $230 free shipping and installed it. Runs great now with no surging. Now if I can only remember to run the thing every month so it doesn't clog up again is another question.
darsben1
Explorer
Aug 06, 2017
Surging is usually caused a dirty carburetor. The first thing to do is clean the carb before trying to adjust anything. If it was running well in the past but now surges then it is most likely gummed up carb.
Model number would help so that someone with a Repair manual for your model can advise you.

Forum Discussion

Onan Carb adjustments

12 Replies

About Motorhome Group

Related Content

How to adjust LED headlights?

Feedback on $50 Onan carbs on Amazon?

Onan generator Carb cleaning, no need to replace carb.

Onan Adjustment

Onan 4000 carb pics