This bike worried me also I believe it is a 75 motor due to the cylinder head,clutch actuator,mag cover and no #s on cases ,looks as if it is a 75 tank ( large tunnel area) and also 75 MX rims as they had the lip on them by tire. The frame #s are 432-0006 as told to a friend of mine Non YZ forks (Honda) and who knows what else The owner didn't seem to be interested in giving many details either Sounds fishy still a decent price if it doesn't need anything He sold it also ! Tom