Bike jus had a new top end rebuild along with cam chain and bike ran great for 2 rides and i started it with my hand it has less power and bogs some. i havent cranked it since the day at the track. my opinion i think it is something to do with the auto decompressioner. it doesnt close quickly. when i wire it open the bike has so much compression i cant kick it over.and it also jus had intake valves.