Hey guys, I am fairly new to Gas engines. I have a H9 1/3rd scale CAP232 that I put a Brison 4.8 on. I bought the engine slightly used. It has CH ignition with SyncroSpark. On the ground the engine sounds good, even at full power. However in the air on verticals, it misses like you are turning the ignition on and off briefly. I have adjusted the carb to peek and then backed it up about 1/8 turn to the rich side and no change. I have added the mod on the carb to cary the vent hole into the fuselage. I have added the baffles in the cowling. Any ideas?

I am thinking about changing the plugs (although it would seem that if they were going to miss the will miss on the ground at full throttle).

I am thinking about replacing the switch for the ignition battery and even thinking about changing the ignition battery.

What else, sell it and get a DA or 3W?

Send it back to Brison and see if they can fix it?

It also sounds ruff at midrange, I don't know if that is normal or not. I have heard some other engines sound like that?

any Ideas would be apreciated


Thanks,
Ernie Hughes