Description
The Cylinder Works Stock Cylinder Head Kit is a direct replacement for the standard bore cylinder head on the 2005-2021 Yamaha YZ 125. It features a competition valve job, C630 (nickel/aluminum/bronze) valve seats and guides, and shortened valve guides to accommodate higher lift cams. The combustion chamber is unshrouded, and the bowl is blended for improved performance while retaining stock-shaped ports. The kit includes cam caps and cam cap bolts but does not come with valves, springs, or lifters.
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