Replacement cylinder head assembly for the UMS 9-99cc, the nine-cylinder 99cc four-stroke radial from UMS.
Function: it is the cylinder head assembly, carrying the combustion chamber, valve seats and the rocker gear for that cylinder.
The reason this ends up on an order: heads are replaced or reconditioned when valve seats recede, a valve burns or a spark plug thread is stripped.
Fitting note: Check head flatness and fit a new head gasket; re-torque the head screws after the first run.
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