There is a gas engine forum you can look at too. If it is bogging down then it is just the needled adjustment. The tuning of the needles is just like on a glow engine, you set the high needle first then the low end. I adjust mine a couple hundred rpm fat then after flying I fine tune them depending on what is needed. Once set I leave them alone.
Really, go into the gas engine forum and look around. It's a lot of work taking photos and teaching how to time one and posting it in the beginners forum when it has already been done in the gas engine forum. Gas engines aren't something most beginners will be using for a while.