O.S. Engine OS21285220 Precision Slide Valve Guide Screw for 10A/10F  [OS21285220]

Durability and fit for 10A and 10F

This slide valve guide screw is a replacement part tailored for 10A and 10F carburettors used in RC glow engines. It acts as the slide guide and stop, ensuring repeatable travel that contributes to steady idle and predictable throttle response.

To fit the screw remove the carburettor from the engine and disassemble the slide assembly to reach the guide; install the replacement and reassemble while checking that the slide moves freely. Inspect both the slide and screw for wear, and avoid forcing parts together to prevent damage to mating surfaces.

As part of tuning and maintenance, a correctly seated guide screw supports reliable slide alignment and repeatable throttle transitions, making idle and speed adjustments more dependable. This is intended as a model engine accessory for routine servicing and setup work.