47mm BBK Safe Rev Limit

[shortman1166]

I installed a 47mm BBK and derestricted air box and got the thing jetted properly but now when I am riding on flat ground I can easliy hit 9500-10,000 RPM at about 45-48mph at WOT (GPS) unless I back off the throttle. What is a safe red line limit? Should I install heaver weights to lower the RPM? 

[humanshield]

after 8,000 it's wound up pretty tight.
Unlike a 2 stroke with nothing much slinging around other than the crank and the reeds, you've got all that valve train and cam chain etc moving around.

Some of my 4 stroke bikes were designed to hit 13,000rpm, but not these little basically stock scooter motors.

I'd keep it under 8,500 as much as possible. Tune it to deliver peak power to the CVT there or under.

Just my 2 cents. Some run theirs higher. Depends on how long you want it to last also. If all you care about is speed....remove the rev limiter

[jeff84]

I say as long as the valves aren't floating go for highest rpm possible. these motors are cheep enough to rebuild