Larcor69 3 #1 Posted September 29, 2018 Just picked this up, changed filter, oil, lubed her up, ran great for about 10 mins, then started lopping, even under load, engine goes from 3000 rpm to 1800 rpm up and down, would this be caused by a governor or a dirty carb? Thanks 1 Share this post Link to post Share on other sites
ol550 830 #2 Posted September 29, 2018 I'll vote dirty carburetor. 1 1 Share this post Link to post Share on other sites
Larcor69 3 #4 Posted September 29, 2018 I put some seafoam in gas tank, if it persists after another tank of gas, guess I will get a rebuild kit, Thank you everyone 2 Share this post Link to post Share on other sites
lynnmor 6,812 #5 Posted September 29, 2018 If you let it cool down completely and then it runs normally till it warms again, that is a sign of a governor problem. If you run the engine at high speed, say 3200 RPM, and then it overspeeds after warmup with no change in throttle setting, let me know. But yes, clean that carb to rule out problems in there. Often you can clean the carb without buying parts. Share this post Link to post Share on other sites
Larcor69 3 #6 Posted September 29, 2018 Just now, lynnmor said: If you let it cool down completely and then it runs normally till it warms again, that is a sign of a governor problem. If you run the engine at high speed, say 3200 RPM, and then it overspeeds after warmup with no change in throttle setting, let me know. But yes, clean that carb to rule out problems in there. Often you can clean the carb without buying parts. Share this post Link to post Share on other sites
Larcor69 3 #7 Posted September 29, 2018 Yes, I let it cool off for about 20-30 mins and it ran fine, doesn't sound as if it over speeds at all Share this post Link to post Share on other sites
WVHillbilly520H 10,369 #8 Posted September 29, 2018 Might be the ignition module, does it back fire and die, then once it cools down it fires back up. Share this post Link to post Share on other sites
Larcor69 3 #9 Posted September 30, 2018 No, it runs just rpms go up and down Share this post Link to post Share on other sites