61H Series Carburettor Sub Needle Replacement - YSR6202S YS Engine  [YSR6202S]

Notes on the 61H sub needle

This sub needle is a direct spare part labeled YS Engine YSR6202S for use with 61H-series carburettors on RC glow engines. It is the replaceable component that helps regulate fuel flow at idle and through the midrange, intended for careful tuning and routine servicing.

To install, follow common carburettor access procedures: remove the carb top or needle holder following your carb's layout, swap the original sub needle for the YSR6202S, and confirm unobstructed needle movement before reassembly. No specialist tools are normally required beyond small hex or screwdriver tools used in engine maintenance.

For tuning, the sub needle affects a limited portion of the throttle range; use cautious adjustments and verify performance on a controlled test. If idle or midrange problems persist after replacement, re-examine the needle seating and carb linkage for correct setup.