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Hi guys. Ive recently purchased an 04 660 that jumped timing and destroyed the head and piston.
I got a 102mm 9.9:1 piston, mud buster cam, timing kit, and head. Rebuilt everything and its running and driving. Seems a bit hot, but they all do from what I understand.
The bike pulls and very rarely (but sometimes) midrange will cough once and continue to pull.

The plug seems light to me. Ive showed it to a few people and some say fine, some say dont run it.
I don't know whats in the carb. Stock intake and exhaust.
Located in Florida about 25' elevation
Any insight would be great. Pic attached
 

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