what is the difference between the 2004 and 2005 and 2006 yz450f cylinders(jugs)?
'06 and later route the top end oil supply through the cylinder internally. '05 and earlier need the external oil manifold. The bolt and gasket pattern is also different.
'03-'05 YZ450F, & '03-'06 WR450F interchange.
'06-'09 YZ450F, '07 and later WR450F, and '09 and later YFZ450 Quads interchange.
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