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Discussion Starter #1 (Edited)
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.
 

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