This ball bearing is supplied as a single replacement for the O.S. engine codes listed above. It supports the rotating shafts inside small glow and gas model engines and helps minimise contact friction between moving components.
Fitment is limited to the engine codes specified: R 25SF, 25FX, 32F, FS-26S, FS-30S and FS-40S. Prior to pressing a new bearing, visually confirm size and alignment to ensure the unit seats correctly without tilt.
Installation guidance: a bearing press or soft-jaw vise is recommended to avoid race or roller damage. Keep joining surfaces free of debris and avoid pressing on the inner race alone to prevent altering preload. Verify shaft runout and endplay after assembly to maintain stable engine behaviour.
Maintenance note: renewing a worn bearing reduces mechanical drag and helps sustain steady idle and throttle response; treat this as scheduled upkeep rather than a performance mod.
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