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Join Date: Jan 2011
Location: Central Illinois U.S.A.
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To answer a previous question - is the motor original to the frame - according to the Honda model identification guide, you have have 1985 engine cases. trx2five0 is right about the difference between a sport and utility quad and the number of valves in the engine.
The TRX250 (product code HA8) was produced 1985 to 1987 then discontinued.
1985 engines started with serial number TE06E-5000001
1986 engines started with serial number TE06E-5100001
1987 engines started with serial number TE06E-8200001
To answer the last question - unless the Ebay, Craig's list or any other seller states specificly the model the part is off of, you should question for specifics. A good start would be to ask if the part is off a chain drive or shaft drive. A good second question would be if the motor is a 2 valve or 4 valve.
Hope this helps