O.S. Engine OS4A404000 Cylinder Head GGT10  [OS4A404000]

Cylinder head for GGT10 engines

This O.S. Engine OS4A404000 cylinder head is an RC-scale replacement part labeled for the GGT10 family. It serves as the top cover for the engine's combustion chamber and is intended for routine repair or part refresh on compatible GGT10 engines from O.S. Engine.

Installers should treat this part as a direct replacement: remove the engine head following the engine maker's service procedure, inspect the sealing surfaces and head gasket, then refit the head using the correct fastener sequence and recommended torque values from the engine manual. Avoid overtightening and confirm proper clearance for the glow plug and cooling passages.

For tuning and maintenance, the head is primarily a service item — replacing a damaged or warped head can restore consistent compression and sealing. It can also be used during rebuilds when checking piston, sleeve, and carburetor settings to ensure the engine runs reliably in scale RC use.