Help with an Onan Performer 20

Posts : 6 Join date : 2009-07-20

I'm working on an F910 with this engine. I think it's only running on 1 cylinder. It's surging and when I take off the right plug it stays the same and it won't run on the right plug by itself.
I know it could be a bad plug, but what else should I look at?

Thanks.

Subject: Re: Help with an Onan Performer 20 Mon 20 Jul 2009, 12:52 pm

welcome dolmar I am not familiar with your engine but I would also start with the plug change it out then my next step would be check for spark I don't know if you have a coil or electronic ignition but that is the next step .

Posts : 6 Join date : 2009-07-20

I now have spark on both cylinders. I think it was something loose.
It still sturging. I think it's fuel related. It has good spark on both cylinders and good compression (115 and 120 cold)
I'm going to change the fuel filter next and go from there. I'm thinking the carb might need rebuilt or cleaned.

Is there something else that could be causing it to surge?

Thanks

Subject: Re: Help with an Onan Performer 20 Tue 21 Jul 2009, 10:38 am

Chances are its dirt in the carb. or possibly a vacuum leak I usually buy a can of sea-foam and mix up some gas and run it for a while sometimes it clears right up if not then clean out the carb.

Posts : 6 Join date : 2009-07-20

The problem is carb related I'm sure. I ran some Berryman's though it and it got better, but not much.
It will run just fine if the choke is partially pulled out. I'm going to clean the carb next. I'm thinking this should do the trick.

After I get this running good. Than it's greasing and oil changes and start cutting with her.

Subject: Re: Help with an Onan Performer 20 Thu 23 Jul 2009, 11:09 am

Dolmar wrote:: The problem is carb related I'm sure. I ran some Berryman's though it and it got better, but not much.
It will run just fine if the choke is partially pulled out. I'm going to clean the carb next. I'm thinking this should do the trick.

After I get this running good. Than it's greasing and oil changes and start cutting with her.

something to check dolmar,try running your mixture screws out and see if the engines changes,loads up whatever,a dirty carb usually doesn't change much when you mess with the mixture screws,an easy thing to check,works on singles good anyways I 'm not real smart on twin's,,KW