If it's not the compression or valves, I'd look at that horrible cat. That entire exhaust system is terribly restrictive. All I did was open up the muffler on my daughter's 50cc quad and it was a totally different machine.
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Weldangrind
"I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
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