21XZ-R Compatible Head Gasket (AL0.2) - OS22014160 by O.S. Engine  [OS22014160]

21XZ-R head seal component

Specifically intended for engines marked 21XZ-R, the AL0.2 gasket is a thin-profile seal installed between the cylinder head and crankcase on compatible RC engines, helping preserve correct compression space.

Fitting procedure: discard the old gasket, clean both mating faces and align the new seal to the head ports and bolt pattern. Tighten bolts progressively and evenly to the recommended values; avoid over-torquing and confirm the head face is straight prior to finishing assembly.

Role in tuning and upkeep: the gasket maintains the combustion chamber volume and prevents leakage that can upset tuning decisions. Inspect the seal at routine maintenance or whenever compression testing reveals a drop or visible leaks occur.