YS Engine YSG1045 Disc Valve for FZ70S RC engine  [YSG1045]

Disc valve for FZ70S

This YS Engine YSG1045 disc valve is an RC-scale replacement part intended for use with the FZ70S family of model engines. It serves as the intake control element in disc-valve type two-stroke model engines, restoring correct timing and sealing where the original valve is worn or damaged.

Installation is a bench-level procedure: remove the engine’s intake cover, extract the worn valve assembly, inspect mating surfaces for wear, and fit the replacement ensuring the disc aligns concentric to the crankcase port. Final checks should confirm smooth disc rotation and correct clearance before reassembly and break-in run.

For tuning, the disc valve affects intake timing and transient response; replacing a degraded disc valve can recover throttle feel and consistency during acceleration. Regular inspection for nicks, warpage, and seal integrity is recommended as part of routine engine maintenance.