R 25SF Compatible Ball Bearing OS22630002 for O.S. Engine Models  [OS22630002]

Why Replace a Worn Bearing?

This bearing is an aftermarket replacement designed for the O.S. engine models listed in the title. It is supplied as a single bearing element that supports rotating shafts in small model engines and reduces internal friction.

Applicable engine codes include R 25SF, 25FX, 32F, FS-26S, FS-30S and FS-40S. Always check the bearing dimensions and fit before pressing a new unit into the crankcase to ensure correct seating and alignment.

Fitment tips: use a proper bearing press or a soft-jaw vise to avoid damaging the races or rolling elements, keep components clean, and do not apply force to the inner race alone to prevent unwanted preload changes. Recheck shaft runout and endplay during reassembly to keep engine behaviour predictable.

Performance perspective: installing a new bearing reduces mechanical drag, which can stabilise idle and throttle transitions. This maintenance step improves reliability rather than increasing peak power.