These engines are not easily tuned, so I have been told. There are a lot easier one out there. I just did very small adjustments 1/8th turns at a time. you will have to wait alittle bit for the adjustment to take place, so don't do a bunch of adjustments at once. Once you make a adj. blurp the throttle a couple times while running. Make sure you see really good smoke coming out of the exhaust.