There was a rev limiter on some of them for a while. it started around 7,000 rpm. You have to buy a different coil assembly to get rid of it.

The limiter didn't present much problem if you ran a 18-8 on a stock engine. I'd only go past 7,000 in a dive.

With a 7/16" carb and open exhaust, they can get up around 7400 with a 18-8 Dynathrust.

Enjoy,

Jim