My generator has always run fairly well up until recently.  Now it will start up right away but never smooths out, to the point where it will almost stall out, backfire, then speed back up.  I started with the simple stuff, changed the fuel filter, pulled the carb off and went thru it.  Both of which had no obvious issues and made no difference at all.  Any advice on what to try next would be greatly appreciated.  The boat is a '69 35'.  Thx!

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Try this forum they are very good with onans.

Mark, Have you set or changed the points?  Does it do it randomly? How is it under load? Governor set correctly? Just a few thoughts.

thanks Sterling.  it does the same thing whether loaded or not, and it does it all the time.  but it is a new issue, it ran fine early in the spring.  my next step was to pull the plugs to see if they had a story to tell, i will add points to my list.  as far as the governor goes, i lubed all the linkage points, i will have to get smarter on the adjusting.  but nothing should have changed..

Sterling Shriber said:

Mark, Have you set or changed the points?  Does it do it randomly? How is it under load? Governor set correctly? Just a few thoughts.

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