Hey gas engine experts. I have a puzzling delimma. On an RCS 180 that has been running great since around 1999 I have started having problems.

It started when I tried to fuel it and fuel began gushing out of the carb. Took the carb apart and cleaned it like I have done in the past. This took care of the the fouled fuel metering valve so I could now fuel it without fuel running out of the carb. Started it and it idled beautifully adjusted the needles and it performed flawlessly. I then filled it up to fly again and I couldn't get it to go past idle,,, like nothing was drawing off the high speed needle. Advance the throttle and it dies like its lean. If I bring the throttle back when it starts to lean out it idles like a champ. It will idle the tank dry.

So I ordered a carb rebuild kit and installed it. Replaced the metering pin, lever, gaskets, and diaphrams. Blew out all the ports with compressed air and carb cleaner. Cleaned the pulse opening to ensure there is no blockage. I reinstalled the engine in the plane and no change. Can't get it to go above idle. This is not a reed engine it is a disc valve engine. Also, I pulled the head off to see if there was some blow by on the rings,,, All looked good.


Your advice on what to do next would be greatly appreciated


Thanks in advance,

Robert