YS Engine YSS8132 Low Speed Needle 61ST-2 low-speed needle valve for RC engine carburettors  [YSS8132]

Low-speed needle valve for RC carburettors

This is a low-speed needle replacement designed as an RC-scale carburettor spare for YS Engine products. The part functions as the low-throttle adjustment needle in a carburettor assembly, serving the specific role of setting idle mixture and shaping the engine response at light throttle. The description below focuses on compatibility awareness, installation considerations, and practical tuning role without assuming additional specifications.

Compatibility note: the item name indicates it is a YS Engine low speed needle, intended as a direct replacement part for YS Engine carburettor assemblies. No other chassis or brand compatibility is asserted here.

Installation and handling:

• Access the carburettor and remove any air filter or cover to reach the low-speed needle location.
• Carefully unscrew the existing low-speed needle, noting the baseline turn count or seating position so it can be restored if needed.
• Install the replacement needle in the same orientation, set to the factory baseline before making fine tuning changes, and verify there is no binding when the throttle is moved.
• After fitment, perform a controlled run-in and recheck idle and low-throttle response, making incremental turns while observing engine behaviour.

Tuning role:

• The low-speed needle controls fuel mixture at idle and during low-throttle openings, affecting smoothness and throttle transition.
• Use small adjustments and test runs to avoid over-lean or over-rich conditions; start from the original baseline setting.
• Replacement needles are commonly used when wear, damage, or clogging affects mixture control at low throttle.