I have an evolution engine also a trainer 46 on a PT 40 the engine wouldn't run right until I put a K&B idle bar glow plug and it likes 15% nitro and I took the three bladed prop off too. I use a 10-6 and I find that the engine likes to run slightly rich then it'll idle all day and do anything you want but for the money I wouldn'd trade my MDS 48 for anything it has twice the power I use it on a LT40 with floats and it's the most reliable motor I have the plane weighs 8 pounds and it flies great.