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

Throttle lever fixing nut for RC carburettors

This O.S. Engine OS21481420 throttle lever fixing nut is a small-scale replacement part designed for RC carburettor throttle linkages. Supplied as a set of 10 pcs, it serves as a direct consumable for routine maintenance, repair, or quick swapping during track days and bench tuning.

Functionally it secures the throttle lever to the carburettor spindle, helping maintain consistent throttle geometry and repeatable idle behaviour. Because throttle linkage play directly affects throttle response and low-end idle, replacing worn fixing nuts can be a simple way to restore crisp control without altering main jetting or needle settings.

Installation is straightforward: remove the existing nut from the throttle lever stud, position the new fixing nut on the threaded section, and secure it while checking for smooth lever travel and return. After fitting, verify full throttle and idle positions to ensure no binding or excess preload affects servo centring or throttle return springs.

Notes on compatibility and selection: the item is intended for use with RC carburettor throttle levers and related linkage hardware; verify the original nut profile and thread engagement before fitting to confirm a match. Keep spare pcs in your maintenance kit so you can replace worn fasteners quickly at the field.