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this one was tuned pretty well. A honda 450 with the hrc cam and a full yosh exhaust made 42 i believe with slicks also. Both seemd to be running very well.
I rode a YFZ 450 with a slip-on/rejet and it was incredible. However, I would not trade it for my bike. I think that once I get cams and a bigger carb (frc or edelbrock? hmmm), I'll be pretty close.