I picked up a 71 model that runs pretty good its very clean ive ordered a new carb its got that cheapo unit on it with no adjustment for throttle cable length. ill be going over everything today after work lubing cables adjust chain check battery water etc. Ive still got to reassemble my other motor with the 100cc piston and torque cam but i got involved in other projects and lost my momentum. so im planing on completeing the motor this winter and riding the new bike while rebuilding the 77. ive got enough spares now to do almost anything three complete bikes 4.5 motors so im on a roll here. im thinking of trying to hunt up a mini trail frame and putting my spare 90 motor in it if not maybe in a regualr mini bike frame if i can find oen with real brakes.