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'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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