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Need help Identifying an older YZ 125 Engine

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I have a bike I picked up that has A Yamaha YZ 125 engine in what I believe is a Honda frame.  The bike was explained to me as a 1987 YZ 125 but the engine code not match up.  The code is 97D-003186.  Can anyone tell me what it is?

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Look at the vin below t hhggg e handle bars stamped on the frome

Look at the vin below the

handle bars it is stamped on the frame

Thank you for your response.  I have checked that out and it is NOT Yamaha.. So, I am just throwing out what is on the Engine to see if anyone can identify.

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Post a pic of the cylinder, in the area of the exhaust port,

 

if it's an '87 YZ125 engine, it would have a YPVS housing,

a '87 CR125R engine would have an 'ATAC' chamber in the exhaust flange

Edited by mlatour

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If you could, please post a photo of the whole bike. It sounds interesting.

Here is a couple of pics of the bike.

100_8707.JPG

100_8708.JPG

100_8709.JPG

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it's either an 86 or 87 YZ engine and chassis. Not a Honda frame.

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