ORIGINAL: Ed_Moorman

I have 4 of them. Pretty good little engine.

Open the needle up 3 turns or so and crank. LEAVE THE BATTERY ON. advance the throttle slowly until you are at full power. Now lean out to a peak and richen up 3-4 clicks.

If it still won't go to full power from idle, you probably have a bad plug.

My buddies are always carnking up and snatching the battery off, then wonder why it quits sometimes when they power up. The crankcase may be full of fuel and douses the plug. I think it is best to crank at a high idle, then slowly advance the power to blow out the crankcase. Then I idle down, remove the battery and go fly. Much more reliable.

You also might want to check the low end needle on the throttle arm side. At idle for 15-20 seconds, then flip to full power. If it chokes and spits, it's way too lean. Open, screw out, the low end needle a quarter turn. If it revs up slowly and smokes on the way up, it's way too rich. Close, screw in, the low end a quarter turn. Once you get close, go to 1/8 or 1/16 turns. Most engines have the low end set rich at the factory so expect this unless you have been playing with it.

If you have the low end totally messed up here is an old trick from Super Tigre from the 1970s. Hook a long piece of fuel tubing to your fuel nipple instead ot the tank line. Stick a T-pin in the carb and close the carb so it holds the pin. This is to get a small opening. Screw the idle needle carefully in until it is about closed. Blow through the fuel line, put your ear down near the carb and slowly open, screw out, the needle. When you hear a hiss, stop. This is a good starting needle setting.

As I said, I have 4 in twins and a buddy has 2 in a TwinStar. We started with 9-6 props and had loads of trouble. I had one engine go sour, just wouldn't keep running. Another fractured the lower con rod bushing, which went through the engine. Hobby Services from Tower replaced both engines. We have since started using 10-6 props to keep the rpm down a little and have had much better results. I have the second replaced .32 on my break-in plane, a Little Stick, and it is running great. I am running a 10-6 and can hover the plane for a while so it has plenty of power on the larger prop. I might try something like a 9-7 or 9-8 on my TwinStar later on.