YS Engine YSS3019S Carburetor Assembly for 120SR Engines  [YSS3019S]

YS ENGINE CARBURETOR ASSEMBLY 120SR #S3019S
Price:
£34.00
Brand:
YS Engine
Model:
YSS3019S
GTIN:
4560105743104
Condition:
Brand New
Write a review

Fit, function and recommended use

This RC-scale carburetor assembly carries the YS Engine part number YSS3019S and is specified for the 120SR family named in the title. It is intended as a replacement part to re-establish correct fuel metering and idle control on compatible model engines and not as a full engine product.

The serviceable assembly fits the intake flange, links to the throttle arm and throttle linkage, and accepts standard mixture needle adjustments for tuning. When replacing, confirm flange seating, the condition of any gaskets or O-rings, and free throttle travel to avoid unintended air ingress or binding.

For tuning, use incremental needle adjustments to set idle and main-jet behavior, perform cautious run-in checks on a bench or in a safe area, and verify performance under realistic load. The description emphasises fit and operation rather than detailed installation steps.

Specifications

  • Item Carburetor assembly
  • Material Unspecified
  • Model Number YSS3019S
  • Compatibility YS Engine 120SR series

Intended as a service replacement for RC-scale engines, the YS Engine YSS3019S carburetor assembly aims to reinstate predictable fuel control and a reliable platform for needle tuning; always check fit and sealing prior to use.

Can this carburetor be used on engines of similar displacement from other makers?

The part is listed for the YS Engine 120SR series. While physical interchange with other manufacturers' engines is possible, differences in flange dimensions and throttle geometry mean you should compare mounting and linkage details carefully before assuming compatibility.

What tuning approach gives reliable midrange response?

Tune the idle needle first to achieve a stable idle, then adjust the main needle for midrange and top-end while observing plug condition and throttle response. Small, measured changes and testing under load will help you converge on a balanced setting.

How do I detect an air leak after installation?

Watch for unstable idle, poor throttle response, or a consistently lean plug reading. Physically inspect flange seals and linkage areas, and use a light fuel spray or leak detector around joints to identify escaping air.

Are there performance differences between this assembly and rebuilt or modified carbs?

A direct replacement like this restores factory-style metering and predictable needle response. Rebuilt or modified carbs may change flow characteristics and require additional tuning; choose replacements when consistent, documented behavior is preferred.

Copyright © 2008-2026 rcjaz.co.uk All rights reserved