Stevebow, I'm am currently working on a similar problem as you. I called horizon hobbies and they told me the factory needle settings

are 1 1/2 turns out. This is a good starting point. I have new 15% fuel and I am using OS 8 plugs and neither have helped yet.


Also make sure the carb is tight to the engine, mine was coming loose at one during flight. [sm=eek.gif]