Outdoor Power Equipment and Small Engines - Briggs surging at high RPM

Doityourself.com community forum was created to provide answers to all questions related to home improvement and home repair. Doityourself community can help you find information about how-to topics on small fixes to large remodeling projects. With comprehensive how-to content and expertly moderated community forums DoItYourself.com makes it easy to tackle even the most complex home improvement projects.



PDA

View Full Version : Briggs surging at high RPM

whosnext98
03-24-09, 06:17 PM
I have a 5 HP briggs engine on a rear tine tiller. Sarts fine and runs well four the first few seconds, then it will surge in RPMs up and down. If I am tillig the engine will maintain a steady RPM. Any one have any ideas? It idles well.

geogrubb
03-24-09, 08:45 PM
Post the engine model, type and code numbers usually found on the engine shroud just above the sparkplug and someone will tell you how to fix it. Have a good one. Geo
BFHFixit
03-25-09, 08:11 AM
I have a 5 HP briggs engine on a rear tine tiller. Sarts fine and runs well four the first few seconds, then it will surge in RPMs up and down. If I am tillig the engine will maintain a steady RPM. Any one have any ideas? It idles well.

It sounds to me like this is something that I have found common on tillers. I don't know that it is supposed to or not, but as long as it idles and has good steady power under a load, just back off the throttle a bit when not under a load.
I have adjusted the full throttle stop down and get it to smooth out, but sometimes that causes it to lug down under high load.
See if it will smooth out by just backing off full throttle a bit. If it smooths out then try with a load on it.

Airman
03-25-09, 09:24 AM
Model number, etc. would be most helpful. No matter what engine this is I suggest a thorough carburetor cleaning, to include welch plug removal, if applicable.