About 100 to 110 is all they will do out of the box with a big fella on em. But mine now will kick it on upwards of 120. And will get there faster than it would get to 100 now. With a few minor modifications. These things have very restrictive intakes and exhaust that severely hamper performance.

I have no faith in human perfectability. I think that human exertion will have no appreciable effect upon humanity. Man is now only more active - not more happy - nor more wise, than he was 6000 years ago. Edgar Allan Poe