F120 Intake Disc Valve YSF1227 - YS Engine  [YSF1227]

Replacement Disc Valve for F120 Glow Engines

This component is an RC-scale disc valve for F120-class glow engines, supplied under the YS Engine YSF1227 designation. It is produced as a direct replacement for the intake disc assembly for use on compatible F120 engine units.

To fit the part, carry out routine engine disassembly to reach the intake assembly, remove the old disc valve, install the YSF1227 unit, then reassemble and check for leaks and a steady idle. Adhere to the manufacturer's service guidance to preserve seals and timing settings.

The disc valve governs intake timing and throat opening on two-stroke RC engines, so replacing a worn valve can restore consistent throttle response and idle behaviour. This part is intended for maintenance or tuning when correcting irregular throttle response, reduced acceleration, or fuel draw issues on F120 engines.