jeepman 0 #1 Posted March 20, 2010 I have a 1988 520h with the onan on it .My problem is that ir runs irraticaly looks to be the govener is going back and forth chainging speeds if i hold it in one position it will steady itself and slowley gain rpm's any help? thanks Share this post Link to post Share on other sites
TT-(Moderator) 1,147 #2 Posted March 20, 2010 Sounds like you need to clean the entire fuel system. (typical Onan P series problem) Share this post Link to post Share on other sites
Herbl 10 #3 Posted March 20, 2010 I have a 520-H also with the same problem and I also cleaned the carb or so I thought. After my first cleaning it was doing the exact same thing, surging and the choke would smooth it out. I'm into Classic Cars and one of my car friends is a Toro Tech and he told me what to do. Take the top of the carb off and use carb cleaner and squirt it down every hole you see, if you look down the ventura you can see 3 tiny holes above where the idle screw comes out, they are air bleed valves and they are tiny and they get clogged. Just keep squirting carb cleaner till you see it coming out of these 3 holes and your surging will be gone, I hope this helps it sure did me... Share this post Link to post Share on other sites
