O.S. Engine OS27902000 Nitro Engine Crankshaft for 61SX-H & 61RX-H  [OS27902000]

Crankshaft Replacement for O.S. 61SX-H/61RX-H

This O.S. Engine OS27902000 crankshaft is an RC-scale replacement part intended for O.S. 61SX-H and 61RX-H nitro engines. It serves the essential mechanical role of converting piston motion into rotational force and is provided as a direct swap when the original component has failed or shows wear.

Compatibility is limited to the model codes shown, so confirm your engine is a 61SX-H or 61RX-H before ordering. Installation calls for standard engine disassembly and careful checks of bearing condition and crankpin fit; use the correct bearing sizes and validate end-play and lateral runout during reassembly. When performing a rebuild, inspect the connecting rod and crankcase mating surfaces for scoring or uneven wear to ensure proper load transfer.

Crankshaft balance and runout have a direct impact on vibration and tuning stability. After fitting, do a static balance check and a low-speed break-in while monitoring for unusual noises or oil leaks. Correct break-in and solid gasket sealing help maintain consistent throttle response and long-term durability.

Fit this crankshaft to replace a worn or damaged unit in 61SX-H and 61RX-H engines, and carry out standard rebuild inspections for bearings, runout, and sealing to restore dependable operation.