FS Series Replacement Cam Shaft FSa-155 for FS Engines OS42562000 by O.S. Engine  [OS42562000]

Replacement camshaft tailored for FS engines

The FSa-155 cam shaft is supplied as a service spare for FS series engines from O.S. Engine, providing the valve-actuating function required in nitro RC engine assemblies. It is specified for maintenance and tuning tasks where accurate valve timing must be restored.

Fitting generally involves removing the cylinder head and timing gear to gain access to the cam shaft journal, aligning timing marks carefully, and validating valve timing during controlled run-in operations; use appropriate tools and care to protect surrounding components.

When tuning, note that the cam shaft influences valve timing curves which in turn interact with carburetor setup and needle calibration; after replacement, re-evaluate mixture and ignition settings and perform stepwise adjustments while observing running temperature and behaviour.

Fit this cam shaft when worn timing elements need replacing or during engine rebuilds to re-establish correct valve timing, following standard FS engine service practices for best outcomes.