It's Yellow and I'm shure its a 250 yamaha

hellow , I just bought a few parts/bikes recently ,but not shure what yr. or the origanal motor , cause the nums on frame and motor dont agree . maybe someone else with more experience knows . I tried to do other searches on the net but couldnt get any -.thing. The first four nums on frame are 3640 and the first four nums on motor case are 430-0= Would be a good thing to know what kind of critter this is THANKS...dave

Pics would help, plus there are a few sites where all the Yamaha numbers are listed. I think all yamahas had a 3 figure prefix like 3R5, 4V4 and then the digits.

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