[X(] whoa, I had no idea that my topic was gonna get this much attention. Guess I could give a little more info for it. I have a TT 120 ringed engine and here these last couple of flights, its just been a turd with a propeller. it has very poor power at full throttle and runs very hot, doesnt idle good or rev very fast, and sometimes it even has a mind of its own [&:] acting eraticly, no matter how much I play with the needle. and I really dont know much about ringed glow engines (the plane/engine is really my dad's that im trying to get info for) cause im more of a abc guy

Are ringed engines suppose to be really easy to turn over, or are they suppose to have the "tight" compression feel like an abc engine? This TT 120 has pretty much no feeling of compression when you spin the prop by hand, but is does start pretty well. but another thing is I dont how this engine was broken in, or if it even was broke in correctly. my dad ordered a GMS 120 and he was wanting me to break it in for em.

And BTW, not to long ago I got a os 46 ax for my plane (aresti 40). I mounted the engine on the plane (no cowl) and broke it in going by how the manual said to do it, but I dont remember if it was exactly or not.. Started it up, opened the throttle wide open and ran it "4 cycle rich" for 1 tank. and man what a oily mess that was [:'(] . let the engine cool down till it was cold to the touch. ran it wide open rich again but this time turned the needle valve in till it was really singing like it should for about 5 seconds, then back to runnin rich for about 10 seconds. I did this part for 2 tanks of fuel. after that I took it and flew the guts out of it, and its been running perfectly ever since. I guess I've probably ran 2 gallons at least through it by now.

and from all that i've been reading on this topic, I think I've decided how im going to break this new engine in. im gonna just let it warm up till its warm/hot to the touch then go wide open with a fairly rich setting, lean it out a bit and let it scream for about 5-10 seconds and richen it back down for about 10-15 seconds. repeat this for about 2 tanks, letting it cool down in between, then take er out and fly the hussie wide open