Airbleed Screw OS25081202 for O.S. Engine 35RC 40SP 40P 50 Models  [OS25081202]

Airbleed screw — low-speed mixture control

This is an RC carburettor airbleed screw designed for O.S. Engine 35RC, 40SP, 40P and 50 models. It creates an adjustable bleed point to refine the low-throttle air/fuel balance without having to alter the main needle, useful when tuning idle and initial throttle response on the track or at the field.

Use is limited to the listed engine model codes. The component is intended as a direct-replacement service item for carburettor airbleed ports; always confirm the replacement matches the bleed layout of your existing carburettor before installing.

Fitting is simple for those with carburettor experience: remove the cap or carb top as necessary, withdraw the old screw, and thread in the new item until it seats. Make measured adjustments and test performance between tweaks, since the airbleed primarily adjusts mixture at low throttle openings rather than affecting full-throttle mixture.

To preserve service life, clean off fuel deposits, check the threads and seating regularly, and store spares in a clean container to prevent contamination that could impair carburettor operation.