The clutch could use some adjustment or if you can't adjust anymore. The clutch is on its last leg. Follow this link to find out how to adjust the clutch. http://www.se-r.net/transaxle_clutch/adjust.html http://www.se-r.net/engine/troubleshooting_guide/index.html I'd look at this guide and narrow down the problem. Good luck. Everything thing you need is there in the links. Ken
