TheMooseIsLoose 6 #1 Posted October 18, 2014 I have surging problem that I haven't experienced with my other Wheelhorse tractors. When started it runs perfect for about 20 - 30 minutes then starts surging. Does anyone think that there is a gasket or compression problem after the motor heats up. I haven't removed the carb to clean it yet, I just cleaned my 416-8 and it runs fine now. Any thoughts would be appreciated. Share this post Link to post Share on other sites
km3h 543 #2 Posted October 18, 2014 Surging is usually caused by a dirty carburetor. In your case I am not so sure though. If it does not surge upon start up and after you have fully opened the choke it might be something else. When it starts to surge, slowly pull the choke to restrict the flow of air and listen for the surging to stop. If it does, then the engine is running lean which is not a good condition. Lean will cause the engine to overheat. So try the choke and get back here. Share this post Link to post Share on other sites
ericj 1,576 #3 Posted October 18, 2014 if it take that long to act up try checking the tank screen or the gas cap not venting and pulling a vacuum on the tank. good luck eric j Share this post Link to post Share on other sites
varosd 1,185 #4 Posted October 19, 2014 agree with all above, dirty carb, fuel lines, fuel filter, fuel tank screen,gas cap all are suspect. Share this post Link to post Share on other sites
TheMooseIsLoose 6 #5 Posted October 19, 2014 I never thought about the fuel tank screen and the gas cap. I will try all, I don't have time until next friday. Share this post Link to post Share on other sites
LindsayLaperr 5 #6 Posted October 21, 2014 Governor ? Sent from my iPhone using Tapatalk Share this post Link to post Share on other sites
TheMooseIsLoose 6 #7 Posted October 25, 2014 Yesterday I loosened the gas cap and ran for 45 minutes, it didn't act up and worked ok but will use some more to be sure. Share this post Link to post Share on other sites
diamondred 63 #8 Posted October 25, 2014 Come to think of it, my 518 was surging the last time I use it. I remember running at full throttle while mowing when it started surging. I cut it back to about half throttle and it quit surging. Think I need to check my fuel delivery system as well. Share this post Link to post Share on other sites
diamondred 63 #9 Posted October 25, 2014 The governor idea is a possibility as well. What I have read about those settings on the governor arm, the closer to the shaft, the more sensitive it reacts. Probably the most important through is to make sure that the air/fuel mixture is correct. I usually keep mine on the rich side. When adjustable. Share this post Link to post Share on other sites
motox25 36 #10 Posted October 28, 2014 I'd check the governor for loose linkages and springs, this can cause hunting. Could also be an air leak in the carb or intake manifold. Share this post Link to post Share on other sites
louk1 1 #11 Posted November 8, 2014 I just finished doing a carb cleaning on my 89 520HC. It surged and eventually simply ran rough over a couple of year period. I just use it with a snowblower and cab so I was in no particular hurry. Got ambitious a few weeks ago and discovered that the two bolts holding the carb on the manifold had loosened, one was several threads loose. Cleaned the carb (which was not gummed), new gaskets and a valve adustment made her run like new. Runs steady at all speeds. I had to remove the muffler and the manifold in order to do it right. Share this post Link to post Share on other sites