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Help figure out what it is to order parts?

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I’ve come into passion of an old dirt bike that only has a 9 digit vin but doesn’t follow the standard prefix. It’s a Yamaha 250 2 stroke with the four speed and is also street legal (maybe back in its time). The crank case number and number etched in the gram are the same. 510-200729 and I can’t seem to get a picture of it to upload but it is in my profile pic

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I think its an MX400b,  [  The mx250  is 509-000001 ]  



White W/Comp. Yellow

510-000101 to 

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