Eagle / Freya / EX / SX GE Tank Cap - Hirobo HRB-0404761  [HRB-0404761]

GE gas cap designed for Hirobo model tanks

The Hirobo HRB-0404761 GE gasoline tank cap serves as an aftermarket replacement for fuel tanks used on Hirobo Eagle, Freya, EX and SX helicopters. The cap's primary function is to close the tank opening securely to support maintenance and fuel-system adjustments.

Use this cap only with the compatible helicopter families listed; confirm the tank neck and thread interface on your tank before purchase. Fitting is straightforward: place the cap on the neck, tighten until it seats firmly, and inspect for any leaks during a static fuel test. Regular checks of the cap and tank mouth will keep fuel delivery reliable during bench testing and tuning sessions.

During tuning, a well-seated cap helps keep fuel flow consistent and can improve predictability when making throttle or needle changes. Remove and replace caps that show damage or poor sealing to reduce fuel pressure variability during preparation and testing.