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450 quad with dirtbikemotor

Yamaha YFZ450/450R (2004-Present) - Yamaha ATV Forum - www.bluetraxx.com
Well,I've had this 2005 YFZ450 for quite some time. I finally decided it was time to upgrade so I did the usual exhaust system, K&N air filter system, rejet the carburetor. finally decided to tear the motor apart and do some inspection and found out that it has a dirt bike motor instead of the ATV motor. I came to this conclusion due to the fact that the Piston pin is 18 millimeters in diameter instead of 20 millimeters in diameter. I also removed the head and had some porting and polishing done on it. does anybody out there know of any other differences between the two Motors.


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