I recently purchased an airplane that has a fairly new MVVS .26 engine on it. This is my first MVVS engine (I have all O.S. and Saito's in my fleet currently). I tried to start it last night and can't get it run/idle very smoothly (it won't idle at a low rpm very well). The manual does not do a very good job at explaining the setup. This engine has an adjustable "idle-running screw" on the opposite side of the carb needle valve. I kinda messed with it a bit trying to see if one spot was better than another, but had mixed results. Since I am unfamiliar with these engines I thought I'd asking some advice from anyone who could give it in helping me out before I spent lots of time trying to figure it out myself. I guess I'm just more familiar with my existing engines that for the most part didn't take too much tinkering with besides breaking them in and tuning the engine with the needle valve. Thanks and I look forward to any advice!

Trent