DZ140 Tuning Restrictor - YS Engine YSF2193  [YSF2193]

Restrictor insert for DZ140 throat tuning

This restrictor set is an RC-model carburettor component offered under the YS Engine YSF2193 marking and intended for DZ140 glow engines. The part is fitted into the carburettor throat as a replaceable flow restriction to alter airflow and enable closer control of fuel/air mixture during idle and throttle transitions.

Designed for detailed tuning rather than broad performance increases, the insert helps the engine respond more predictably to needle adjustments and improves low-speed running stability. Because it is aimed at subtle changes, it is commonly used during on-track setup or bench tuning to dial in idle and transition behavior.

Fitment should be carried out following the carburettor and engine manufacturer's guidance; the component is an accessory for RC model engines and must only be used where the DZ140 carburettor design accepts a restrictor element. Verify fit against your carb bore and handle glow fuels with appropriate safety precautions.