[quadenthus]

Have 05 Rancher 350 FM, just done a .40 bore over. Small rattle like possibly valves sticking or need adjusting???? Also loss of power mostly in full throttle. Just feels like a miss. Sounds like it may be an exhaust issue . I currently have a HMF performance muffler in pretty good shape. Any help would be appreciated.

 

[Saber6]

Check your valve settings.If that doesn't clear it up my guess is your leaning out on the high end.