O.S. Engine OS28704161 Performance Head Gasket 0.1T 105HZ for Tuning  [OS28704161]

Gasket for compression and tuning adjustments

This head gasket is a direct replacement for O.S. RC engine heads and carries the 0.1T and 105HZ markings. It sits between the cylinder head and crankcase to control combustion chamber volume and maintain a reliable seal while you tune. The 0.1T thickness provides a modest change in head volume, suitable for incremental tuning work.

Fitting advice: make sure mounting faces are free of old gasket fragments and dirt, confirm the gasket is installed in the correct orientation, and tighten the head screws in gradual increments to recommended seating torque. After initial runs, reassess compression and adjust needle or head settings as needed.

Tuning impact: using the OS28704161 gasket alters head volume slightly, so record changes and use it together with carburetor and head adjustments to reach the desired powerband and compression feel.