RC Carburettor Sub Needle for Glow Engines YS Engine YSR6202 61H Replacement  [YSR6202]

Needle function and compatibility notes

The YS Engine YSR6202 Sub Needle Valve 61H is made as a direct replacement for glow-fuel model engine carburettors. As the needle element it governs fuel flow at lower throttle positions, allowing finer adjustments during tuning.

Consider the part a consumable: replace it during regular service or when diagnosing mixture issues. Installing a fresh sub needle can help determine if wear or foreign material in the needle assembly is causing poor running.

Installation notes: access the carburettor according to the engine service instructions, remove the old needle carefully to avoid contamination of the carburettor bore, and seat the replacement with identical orientation and clearance. Make measured tweaks and verify behaviour in stationary tests before track use.

Service role: because the sub needle influences idle and mid-range fueling, use it in concert with the main needle and idle adjustments when optimising throttle response; inspect the needle tip and surrounding area as part of routine maintenance.