Re: Bought bottom end from Boy Go Fast, should I be worried?
That's cause most cheap kits are 38mm stroke.
the 40mm stroke motors will have a straight fire head.
The straight fire is a better head, and also gives more torque.
Everyone wants the cheapest kit they can get, that's why the 38mm stroke motors are everywhere.
But if you pay an extra couple of bucks you get a better motor.