mgk20181 1 #1 Posted January 25, 2018 Hi I have a 520 HC wheel horse with a 20 Hp Onan. Problem is that whether blowing snow, mowing, or tilling the engine will run at the proper RPM's (3600 i'm told) and then all of a sudden it will speed way up so i have to shut it down. it has gotten way up over 4000 before i have caught it. And as i said it only does it intermittently. can anyone help me with this? thanks 1 Share this post Link to post Share on other sites
pfrederi 17,209 #2 Posted January 25, 2018 Sorry i don't have any Onans in my WH Stable but I am sure someone will be along to help you 2 Share this post Link to post Share on other sites
WVHillbilly520H 10,369 #3 Posted January 25, 2018 Most likely a governor issue, Jeff. 3 Share this post Link to post Share on other sites
WVHillbilly520H 10,369 #4 Posted January 25, 2018 Most likely a governor issue, Jeff. 2 Share this post Link to post Share on other sites
WHX?? 47,225 #5 Posted January 25, 2018 (edited) MGK What Hillbilly posted above is probably the root cause as it is well documented. Perhaps @boomers_influence or one of the other Onan gurus can chime in for a better explanation and fix. Close one eye Jeffrey .... yer postin double! Edited January 26, 2018 by WHX14 Speeling 1 1 Share this post Link to post Share on other sites
WVHillbilly520H 10,369 #6 Posted January 26, 2018 3 hours ago, WHX14 said: Close one eye Jeffrey .... yer postin double! I must double tapped, hard to to give up those old mafia days ... 2 Share this post Link to post Share on other sites
elcamino/wheelhorse 9,139 #7 Posted January 26, 2018 @WVHillbilly520H Is that the hillbilly mafia ? 2 Share this post Link to post Share on other sites
WVHillbilly520H 10,369 #8 Posted January 26, 2018 39 minutes ago, elcamino/wheelhorse said: @WVHillbilly520H Is that the hillbilly mafia ? Yup Share this post Link to post Share on other sites
JimmyJam 516 #10 Posted February 14, 2018 to My thought exactly....sounds like a governor problem. I know a lot of governor cross-shaft were plastic and have known to break. Share this post Link to post Share on other sites
mgk20181 1 #11 Posted February 14, 2018 On 1/25/2018 at 9:18 PM, WVHillbilly520H said: Yup yes it definitely was a governor problem. it had a plastic fly ball spacer which loosened up on the shaft so it was allowed to spin. got it fixed with the help of boomer. thanks for all the great replies and info mgk 1 Share this post Link to post Share on other sites