A cylinder head with valve guide to suit the UMS 5-125cc — the five-cylinder 125cc four-stroke radial from UMS.
On this engine the component is the cylinder head with its valve guides already fitted.
Why this part matters: supplied this way because worn valve guides are one of the most common reasons to take a head off a radial — oil past the guides shows as a smoking exhaust.
Fitting note: Check valve stem clearance in the new guide before assembly.
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