YS Engine YSS8132 Low Speed Needle Valve 61ST-2 for RC Engine Carburettors  [YSS8132]

Needle for low-throttle tuning and idle control

This item is a replacement low-speed needle intended for YS Engine carburettor assemblies. It performs the low-throttle mixture adjustment role, letting you set idle mixture and smooth the engine reaction at slight throttle openings; notes below emphasise compatibility checks, fitment tips, and tuning use without stating extra specs.

Compatibility note: the product title identifies this as a YS Engine low speed needle for YS Engine carburettor assemblies. Do not assume fitment with unrelated brands or chassis.

Installation and handling:

• Take off any air filter or carb cover to expose the low-speed needle.
• Unscrew the fitted needle carefully and mark the original seating or count the turns so you can return to that baseline.
• Install the new needle in the same orientation and set it initially to the factory baseline; confirm the throttle moves without catching.
• Perform a controlled run-in and then re-evaluate idle and light-throttle response, adjusting gradually.

Tuning role:

• The low-speed needle controls fuel flow at idle and small throttle openings, influencing smoothness and throttle transition.
• Make minimal adjustments and run tests to prevent overly lean or rich mixtures; start from the original setting.
• Replacement is common when wear, damage, or deposits impair low-throttle mixture control.