YS Engine YSR6202S sub needle replacement spare for 61H series carburettor  [YSR6202S]

Sub needle for 61H series

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 helps set fuel flow at idle and through the midrange, and is intended for model-scale engine tuning and maintenance.

Installation is straightforward for hobbyists familiar with carburettor work: 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 mandated beyond standard small hex or screwdriver tools commonly used in engine servicing.

In tuning, the sub needle modifies fuel metering in a focused range; use small adjustments and verify engine response on a safe test run. If your engine exhibits unstable idle or midrange hesitation after replacement, re-check needle seating and carburettor linkage for proper alignment.