The 60 on a pipe was when I was 19. I wouldn't go that far now anyway. Nowadays I care a little bit more about safety. That was pushing the envelope. Now I have kids, and have grown up a bit. Back then I kinda flew the prop and wanted things to be wild, now that I have gotten back into RC I'd like to learn to really fly well, and under control.

I agree that I made a mistake getting the Saito 72 4 stroke for the DPM Ultimate 40. The vibration I will have to see about, the aileron interconnects and the elevators are all that concern me. I have tried tightening the elevator pull-pull cables a bit more to see if that helps. Course accelerating slowly it also does not vibrate the elevators. The interconnects vibrate from idle on up, and it gets worse as the rpm increases.

If I had the money I think I'd get either a Saito 56, or more likely an OS 50SX for it. My wife, the boss, said NO not right now at least.

The adjusting thing I hope I just have to be patient and get used to the 4 strokes. This is my first 4 stroke, after owning at least 50 different 2 strokes. The Saito runs good and accelerates great, but it won't idle under 3000 rpm. Maybe I need more time for break in. I have about 1/2 gallon through it now.

Since you likely know more about 4 strokes than I, will the OS type F plug help the idle any? Do I just need to let it break in some more? Also I put an exhaust diverter on it and lost about 500 rpm, is that normal? I've never run a diverter before.

TIA and sorry if I was a little snippy earlier Jim.