Hello all,

I'm having some issues on the idle of my OS 55 AX engine and I was hoping someone could help me troubleshoot it. I'm running 10% nitro and an APC 12x6 prop. I belive I have both needle valves set correctly. The issue is with the idle. When I have it on the ground and go from full throttle down to idle, the engine seems to sputter for about 10 seconds and then transitions to a nice smooth idle. If I throttle up again and then back down to idle the same thing happens again. I tried flying it but deadstick. I don't know if I'm getting air into the line or if something else is the problem. The tank in this model is rather large (14oz), so maybe that has something to do with it. There is also very little room for foam between the tank and the frame so I had to use 1/16" wing sealing tape. Maybe it isn't adequate.

Anyway, I'm considering decreasing the tank size to 10oz, adding more foam, and switching out the filter for a different one. Other than that I'm at a loss. Any thoughts or suggestions would be appreciated. This is actually my first OS engine, so I'm alittle disappointed that it is problematic. I hope the solution is something simple.

Thanks in advance for your help.