Airbox restriction? Something in the airboot restricting air flow? (It's been known to happen). Has anyone looked through the carb boot to see the path is clear?
I know GG dyno tests each engine before it goes out. However, that is before it is in the bike. If something made it into the airbox, you'd have a rich condition
Do we know that the timing is set correctly, and advancing per spec (whatever that spec might be)?
Have we pulled the engine apart?
Were the new parts off of the other 300 in the dealer, or off-the-shelf?
Given the ease with which the motor can be disassembled, if it were me, I'd pull it apart (if the quality of the parts already swapped can be verified). Or, just swap motors with the good 300, then start putting your old parts on and and see where that leads you.
Good luck.
blitz
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