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Stm slipper clutch Fitment question

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The parts fiche says that the 2007 YZ450 clutch assembly is exactly the same EXCEPT-

Pressure Plate 1 is a different part number on the YZ450 than the 2008WR

and

The first 3 steel plates are the same on both bikes BUT-

The 2008 WR has 4 different steel plates that make up the rest of the pack?

EVERYTHING else is the same part #

http://www.bikebandit.com/houseofmotorcycles/2008-yamaha-wr450fx-wr450f/o/m17154#sch542539

and

http://www.bikebandit.com/houseofmotorcycles/2007-yamaha-yz450fw-yz450f/o/m10517#sch531158

Anyone have a suggestion on if/how the 2007 YZ450 labeled STM clutch would fit on the 2008 WR 450 by looking at the clutch assembly view?

Do I add all the the YZ steels instead of using those 4 different WR ones?

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If I were you I'd buy a complete 07 YZ450 clutch pack (provided the STM uses a stock clutch pack).

I've got the Surflex installed on my YZ-F and it uses the stock pack.

John

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