This is the cylinder head assembly for the UMS 7-77cc engine, the seven-cylinder 77cc four-stroke radial from UMS.
The part itself is the cylinder head assembly, carrying the combustion chamber, valve seats and the rocker gear for that cylinder.
Why it is replaced: 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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