Onan 4000 Revs up and Down
I have been having issue with my generator, onan microlite 4000. Has gas fuel pump works spark plug new filters are good. Took the carb off and it is clean. Nothing gummed in bowl or jets from what I ...
Forum Discussion
96Bounder30E wrote:wa8yxm wrote:
I believe Surging is "Too Rich". (Sputtering and misfiring is too lean). But do verify that with a good instruciton manual please.. It has been a long time since I played with carbs.
Surging is a function of running lean.......the carburetor is essentially running out of gas and the engine is starting to die when just enough gas re-enters the bowl of the carburetor bowl to let it continue to run again.....in otherwords.......your carburetor has a blocked passage....usually in the main jet.....the Onan jet can be removed once you remove the bowl......blowing out the jet with compressed air or using a piece of mono-filament fishing line will clean the small passages.......never use a paper clip or other metal wire......
96Bounder30E got it right. Surging is normally caused by a lean condition. If rich it will blow black smoke and sputter.
Richard
