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Yamaha YFZ450 or YFZ450R EFI

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Can someone please tell me what if any differences are between these engines. I here that its totally different from the bore and stroke, cylinder head, crank, even tranny?:bonk:

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Not sure on the transmission, but there is nothing shared with the new "R" engine from the regular YFZ.

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Transmission is different, too ( different gears, shafts, and bearings). The R's can be modded to go fast but it's cheaper to hop up a standard YFZ. No comparison on the suspension though. I was beating the snot out of my friends R and it rides and handles quite a bit better than my 06 yfz.

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