I have the OS 75 and only ran about 3 or 4 tanks through. I installed it on a Extra 300S side ways. The problem I'm have is when I start it she runs really rich and slow like its losing power. I have it set at the required 2 to 2.5 turns as the manual says. When it runs I have a LOT of fuel coming from the exhaust. Any suguestion would really be appericated....Thanks

Two to two and a half turns is not the 'required setting' for your engine. That is only a recommended extra rich starting position for the first starts. You must tune or lean your engine from there and how much, no one can tell you since many varibles are at work.

Your manual spells out how to go about the tuning procedure pretty well but you have to read it. Better yet find a local mentor/instructor to help as simple tuning of your engine is a learning process we all must go through.

Depending entirely on one of these forums, while useful is like peeing down a dry well to find water. Network with your local club or find a real live local mentor/instructor.

The AX's are wonderful engines and user friendly.


John

The starting point in the manual is just that- a starting point. Lots of things influence what the proper setting will be on your engine including tank position, your choice of fuel, your choice of glow plug, ambient temperature and barometric pressure, and individual manufacturing tolerances. If this is a new engine, do the break in the way the manual says then set the high speed needle so that a pinch of the fuel line gives you a slight increase in rpm before the engine starts to shut down. Then set the low end so that the idle is steady for at least 30 seconds and then a push to full throttle gives you a smooth acceleration. Then recheck the high speed needle to make sure your tweak to the bottom didn't change it. If you'll do a search on "engine tuning" you'll find dozens of threads on the topic.