40L Carburettor Retainer - O.S. Engine OS25881700  [OS25881700]

Retainer overview and purpose

This O.S. Engine OS25881700 carburettor retainer serves as an RC-scale replacement to secure 40L carburettors in nitro engine assemblies. By keeping the carburettor stable against the engine flange it ensures throttle linkage and needle settings remain reliable under use.

Fitting is straightforward for model mechanics: attach the retainer to the engine flange at the original mounting points, check that the carb sits square in the intake, then verify throttle arm alignment before final tightening. Use the existing screws and hand-tighten to a solid feel, then inspect again after a short run to confirm there is no movement.

During tuning the retainer reduces small positional shifts that can disturb idle and throttle response, helping you preserve baseline settings between maintenance and swaps.