OS32F engine trouble

[paddy]

im really annoyed with my engine, it was running ok until the other day i altered the low range needle to improve tick over, now i cant find a middle setting. ill start it and then when i take the glow adapter off itll stopuntil i lean it up enough so that its not choking the plug, then ill fly it and then when i land ill try and drop the revs to make a change to the main needle to give me a better run in the hover and the engine wont drop enough to stop the rotors, i keep on moving the trim down, it has no effect and then suddenly the engine stops, and i then have to richen it up to start it, then lean it off and it all happens again.
So to recap whenever i lean it off it wont slow the engine down without stopping and when i richen it up the engine stops when i take the glow adapter off, what can i do?
Can anyone diagnose the problem?
The plug is a new os A3
Paddy

[G-DAVE]

Been running O.S. engines for years - never got one to tick over well.
When ever I got the engine running really well in flight I found that the tick over was always on the rich side.
To recap to get the 32's to fly well the tick over is usually on the rich side - this is more obvious on start up when the engine is cold.
It sounds like the bottom end of your motor is lean this will affect the flying.
Dave

[antsis]

I've found that if you adjust the bottom end mixture, you have to adjust the top end as well. This is the method I used on my fixed wing engines. I know it's difficult with a heli, but try adjusting the main mixture a click or two either way after getting the bottom end idling ok.

Hope this helps.

Ant