Hey Taff, the spring can only go one place, put it into the kickstart shaft first then wiggle into the opening in the casing that it hooks into, once hooked pull kickstart out a bit so it just clears cresent shaped doofah and, -with kickstart on is easier- wind it clockwise till the return stop on the shaft clears lug. then push it in and remove kickstart CAREFULLY without pulling shaft out again! then put the keyhole shaped engagey widget in with the spring - should be at about 7 - 8 o'clock ish, then the idler gear, will have to compress spring on engager to put gear on. should be a gooden, when i built the 550 i had to put a thin washer behind the decompessor arm to help the engine end of it onto the return ramp but mine had never worked when i bought the bike as some cowboy had built the engine last time so yours should be fine. Good luck 'ole boy and wear safety glasses! Jared