trams swap

can a 01-02 yz126 5 speed be installed in a yz 450 03-05

can a 01-02 yz126 5 speed be installed in a yz 450 03-05
To answer the question as written, of course not.

Assuming you meant "426" instead of 126, yes, but only with many hours of custom machine work. It's been done, but it was a major PITA.

The '03-'06 WR450 5 speed is a direct bolt-in, but only as a complete transmission.

Read:

http://www.thumpertalk.com/forum/showthread.php?p=2761046#post2761046

My favorite part about the '03 450 was the 4 speed (but admittedly limited for off-road use)

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