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Old 11-19-2008, 06:51 PM   #30
johno
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Joined: Dec 2007
Location: Mount Gambier, South Australia, Australia.
Oddometer: 2,909
The upper shaft section is 28mm, lower 30mm. BMW have 28mm on both.

The main area of concern when doing a swap like this is bearing
cup outer diameter. Lucky the Yamaha and BMW have the same size cup outer diameter. So, all you need to do is get a headstem bearing kit for a Yamaha YZ/WR.
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