YS Engine YSF2193 Restrictor Set DZ140 carburetor tuning part  [YSF2193]

Restrictor set for DZ140 carburetors

This restrictor set is an RC-scale carburetor component supplied under the YS Engine YSF2193 designation and intended for use with DZ140 glow engines. It serves as a replaceable flow restriction installed in the carburetor throat to alter airflow and refine fuel/air mixture behavior during idle and throttle transitions.

Designed for model-level tuning rather than broad performance claims, the part is used to adjust how the engine responds to needle setting changes and to stabilize low-speed running. Because the set targets fine adjustments, it is typically applied where small changes to mixture or idle response are needed during on-track setup or bench testing of a model engine.

Installation follows the carburetor and engine manufacturer's recommended procedures; the component is an accessory for RC model engines and must be fitted only where the DZ140 carburetor design accepts a restrictor element. Users should verify fitment against their carburetor bore and follow safe handling for glow-engine fuel systems.