Sending it to Ed to find an answer is a heluva lot better than whining abt it. I thought i could tune any engine myself, but i needed Ed to give me some tuning tips for the JS since it does tune different than what i was used to and it is very important that the idle gap is set properly. My full mod runs very strong. Ed bores the crank in a way that helps balance the rotating assembly better and in conjunction with the lightened rod it spools up faster and revs higher than the race prep. Ask Joe or Ed for help instead of slamming the engine.