Welcome!
If you install a free flowing muffler like an FMF, you need to re-jet to compensate. I'd suggest that a 200cc engine would need a 110 main and a 25 slow (if it's a Mikuni) to run properly.
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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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