61H Series Carburettor Sub Needle for Accurate Midrange Tuning - YSR6202S by YS Engine  [YSR6202S]

Replacement sub needle for 61H series carburettors

This sub needle is a direct spare part labeled YS Engine YSR6202S for use with 61H-series carburettors on RC glow engines. It functions as the replaceable needle that sets fuel flow at idle and through the midrange, intended for model engine tuning and workshop maintenance.

Installation is straightforward for hobbyists familiar with carburettor servicing: remove the carb top or needle holder as required by your carb design, swap the existing sub needle with the YSR6202S, and confirm smooth needle travel before reassembling. No special tools are required beyond common small hex or screwdriver tools typically used in engine work.

When tuning, the sub needle alters fuel metering in a focused range; make small adjustments and verify engine response on a controlled test run. If the engine shows unstable idle or midrange hesitation after fitting, re-check needle seating and carburettor linkage alignment.