GF40 Precision Piston - OS49403200 compatible with O.S. Engine  [OS49403200]

GF40 piston: fitment and inspection

The OS49403200 piston is supplied for GF40 engine cylinder assemblies and serves as a direct replacement when rebuilding or servicing the engine. The model number OS49403200 identifies this piston for GF40-series applications and assists with parts lookup.

Compatibility is tied to the GF40 family; use this piston with matching GF40 cylinders and kits. Prior to fitting, inspect the cylinder bore for scoring, confirm piston ring freedom in the groove, and verify piston-to-wall clearance. Proper seating and ring condition are required for consistent compression and throttle behavior during tuning.

For maintenance, remove the cylinder head to check mating surfaces and ring movement, then perform a controlled run-in after assembly while monitoring temperature and compression. If you need clarification on which spare parts to order, contact an authorized O.S. Engine dealer or consult the official documentation.

Fit this piston as part of GF40 engine servicing and follow recommended inspection and break-in procedures for dependable running.