Get hold of Rick Brake at RB Mods. I have been running his motors for the past two years with no problems at all. His mods make the motor run cooler and much improved run time. Rick mods the crank and the sleeve on all of his motors. I you currently have a motor that you want to get modded, give him a call and talk with him. Great service and fast turn around. Here is a link to his site: http://rbmods.net/