Pump Valve Springs for DZ70 - YS Engine YSG7071 for DZ70  [YSG7071]

Service springs for DZ70 pump valve

This item, YS Engine YSG7071, is supplied as a pack of pump valve springs for use with the DZ70 RC nitro engine pump valve assembly. The focus is on providing a reliable spare for scale engine maintenance rather than on performance enhancement claims.

Fitting is simple for those who perform nitro engine servicing: remove the cylinder head and pump cover following your normal service steps, access the pump valve assembly, replace the springs while checking seating and travel, then reassemble. Work with basic hand tools and a tidy bench to avoid introducing debris into fuel passages.

Valve spring condition affects pump valve return speed and responsiveness; fatigued springs can produce erratic fuel flow or unstable idle. Replace springs at scheduled service intervals or when return action is sluggish, and confirm pump function on a test bench before returning the engine to operation.