10LA/15LA Needle Set for Glow Carburettors - O.S. Engine OS21781970  [OS21781970]

Replacement needles for model glow carburettors

Supplied as a paired offering, the O.S. Engine OS21781970 needles cover both 10LA and 15LA configurations commonly found on small glow carburettors, intended as aftermarket replacement components. They are designed to re-establish the original adjustment interface and to give repeatable seating for routine tuning tasks.

The needle functions as the primary mixture metering interface, changing fuel flow where the needle seats into the valve. Fitting a new needle can cure unstable idle, poor throttle response, and inconsistent mixture control that appear as components wear. These items are presented as single needle replacements rather than assemblies.

Fitting guidance: only install into carburettors specified for 10LA or 15LA needles, verify smooth travel and correct seating, then follow your engine's tuning sequence to set mixture and idle. Tweak in small steps, monitor engine response, and re-check seating after a test run to ensure consistent results.