Call James at JBS Performance and talk to him. Not sure if his sheave, OD weights, and slug kit will work on a 450 so ask him. Also ask about a PCV, and what exhaust he'd recommend for you.
He's really dialed the clutch and fuel tuning on the 700's so it'd be cool if he did the 450's too. https://jbsperformance.com/yamaha/
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