RE: CY 27 OR 29CC
ive got the ESP raceported 36mm headkit , its power like youve never felt like before , the 29cc 35mm that i was running before had power like it was pretty darn good , but when i installed the ESP 36mm raceported head and run it , it was scary man i first just opened the throttle bit by bit slowly and it was crazy untill i opened it fully and crikey all i can say is that there is just no comparison to the smaller displacements lol the 36mm 30.5cc ESP raceported heads are beastly , definatly buy one and try it