61H Carburettor Sub Needle Upgrade for Midrange Control - YSR6202S for 61H series by YS Engine  [YSR6202S]

YSR6202S sub needle overview

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

Fitting is simple for those used to carburettor work: remove the carb top or needle holder according to your carb design, replace the existing sub needle with the YSR6202S, and ensure smooth travel before putting the carb back together. Standard small screwdrivers or hex keys are normally all that are required.

When tuning, remember the sub needle affects a narrow throttle band; make conservative adjustments and verify results on a controlled test run. If idle or midrange hesitation continues after replacement, check needle seating and linkage alignment as part of your troubleshooting.