Originally Posted by jeffreylin

There are 3 version of the JP. One is "stock" with the silver case, then you have the modified with the black case, and the "full option" which is the same as the black modified one but with hardened crank and ceramic bearing. Modification is done by JP (the company, probably not the man).

As to the speed, I've found that I have to run these engines richer in the bottom and leaner on top for best performance.