Hello Troy - I've had great success with my 110 over the past couple years, but recently I have been having problems maintaining idle and transitioning throttle up prior to take off. I'm running a 15x8 APC prop, Wildcat YS 20/20 fuel, OS F glow plug with the brass ring, the engine is mounted inverted, I have about 12 gallons through it, valve clearances within spec, and it's been about 88 degrees outside. The problem seemed to worsen when the weather got hot and I started on a new gallon of fuel. I've gone through another gallon of fuel since then and still have the same problem, so I don't think that is the issue. Also, since the problem got worse I've been flying without the cowl so I could adjust the low and high speed needle valves as well as the diaphram screw, so proper cooling should not be an issue.

So here's where I'm at now: I tacked my high speed RPM at about 8600 and low speed RPM at 2600 (any lower and it dies). I can maintain idle at that RPM for about one minute, afterwhich it will wind down and die. High end runs very smoothly, but the engine often dies when transitioning up from idle with the glow driver off; at around 1/4 throttle, the engine will begin hesitating as if it is loaded up, and then it will either clear itself out and open up, or die and spin freely as if there is a loss of compression. With the glow driver on, the transition is smooth and the engine will not die. The diaphram screw sits slightly above the housing, which has always been the case on this engine. A small amount of fuel drips out of the carb as I try to start the engine. Once airborne, the engine runs well so these problems are only seen on the ground as I try to run up my engine, taxi out, and begin my take-off.

I've been following the tunning instructions and adjusting the needle valves and diaphram screw, but I can't seem to dial it in. I have a competion quickly approaching (Sept 22nd) so I'm hoping to get the engine running smoothly ASAP. Thanks for your help!

Steve Insalaco
Arlington, VA