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You could certainly drop the $40 USD and buy a Mikuni. Much easier to get jets for, and the jet system is logical.
When you say the plug is black on WOT, did you do an actual plug chop? Was it with a new plug?
Changing the air filter and exhaust to free-breathing parts would create a lean condition.
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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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