O.S. Engine OS21481420 Throttle Lever Fixing Nut Set (10 pcs)  [OS21481420]

Replacement fixing nut for RC carburettor throttle linkages

This O.S. Engine OS21481420 throttle lever fixing nut is a compact replacement part built to secure throttle linkages on RC carburettors. Supplied as a set of 10 pcs, the pack is intended for routine servicing, repairs, or quick swaps at the track and on the bench.

It secures the throttle lever to the carburettor spindle to preserve throttle geometry and consistent idle behavior. Because play in the throttle linkage directly affects response and low speed idle, changing worn fixing nuts is a simple maintenance step to restore crisp control without altering main jetting or needle settings.

Installation is straightforward: remove the existing nut from the throttle lever stud, fit the new fixing nut onto the threaded section, and tighten while confirming smooth lever travel and return. After fitting, check full throttle and idle positions to make sure there is no binding or excessive preload that could affect servo centring or the throttle return spring.

Compatibility note: the part is intended for use with RC carburettor throttle levers and associated linkage hardware; verify the seating profile and thread engagement of your original nut before fitting to confirm compatibility. Keep spare pcs in your maintenance kit to replace worn fasteners quickly at the field.