I broke in a new OS 40 LA over the weekend that has a Plastic remote needle valve assembly. I used the same fuel and propeller I had on the 50 ring. I used the fuel tank, fuel hose and bench mount for the engine. Everything is the same except the engine itself.

The OS 40 does not have bubbles in the fuel after the remote needle valve.

Evidently, the problem is in the metal housing of the 50 FX remote needle valve.

What does OS have to fix it? Doug