I have a Dymond Tiger Moth with a magnum 60 four stroke inverted on it. The low end needle had to be turned almost all the way in to get a good idle and transition. Just make sure you break the engine in before you start leaning it out and low end adjustments should be made a little at a time ( 1/8th turn) I had to spend a lot of time on my knees. I really should get an engine test stand. Good Luck.