Purpose-built for use with engines carrying the 21XZ-R designation, this AL0.2 gasket provides the thin sealing layer between head and crankcase on compatible RC powerplants.
Fitting notes: strip the old gasket and clean both mating surfaces thoroughly. Position the new gasket accurately, then torque bolts evenly in progressive stages. Do not overtighten and verify the head mating surface is free of debris or warping before final assembly.
Durability and tuning: the correct gasket preserves compression and consistent combustion geometry, so replacing worn gaskets avoids leaks and unstable running that complicates tuning. Inspect the gasket when you service the engine or notice reduced compression or fuel seepage.
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