YS Engine YSG7071 Pump Valve Springs for DZ70 - DZ70 Compatible Spring Kit  [YSG7071]

DZ70 pump valve spring kit

The YS Engine YSG7071 pack supplies pump valve springs intended for the DZ70 RC nitro engine pump valve assembly. The listing frames the product as a practical spare part for field service, avoiding performance claims.

Installation is suitable for anyone with basic nitro engine experience: remove head and pump cover per the engine service guide, access the valve assembly, swap springs while checking seating and travel, then reassemble and test pump and idle stability. Use standard hand tools and a clean bench to protect fuel passages from contamination.

In tuning terms, spring condition influences valve return speed and pump responsiveness; weak springs can produce inconsistent fuel flow and throttle response. Replace worn springs during scheduled maintenance or if valve action becomes slack, and bench-test the pump before full-power runs to confirm proper operation.