I am new at this as well but I have been flying for a few weeks and yes depending on the engine clockwise will lean the engine and counterclockwise will richen the engine. What engine is it? Are you bench running it or running it in your plane? You should run the first tank on a bench or in the plane with the plane against a stop or with someone assisting you by holding the plane still. If it is an Evolution engine than it has been broken in at the factory. Start the engine and leave the glow driver on and let it warm up for about 30 seconds and then run it to full throttle and back to idle. You can then remove the glow driver and run the engine back to full throttle and make small adjustments until it starts to stall a bit and then turn it back a couple of clicks. If it will allow even 3 clicks to richen it up. Then you should back it back to idle and let it cool a second. Then run it up to full throttle, and so on and so on. If you go to your engines web site they will have the exact break in recomandations for it and what oil content and what % of nitro etc. You should look it up or it should be in your owners manual. I have been told it takes 3 or 4 tanks to break them in. Don't know if this helps but it's the best I can do. Good luck and hope you enjoy!!!! Mike