BP manufactures its own engines, not based on the other brands. A Main should have them up on their site real soon, engines are already there.

I'll try to get some pics of the sleeve and crank, but you can see them on the bpracing.it site. Try this link: http://www.bpracing.it/parti/motore-...cdba99ffa3d823 scroll down and click on the thumbnail to enlarge.