ORIGINAL: CGRetired
Bruce: The possible exception to that is the OS 74 AX I just bought for the Protege. I started it up yesterday, ran it about 2 minutes at a high idle, then gradually increased it to full throttle with a very rich mixture and ran it that way for another several minutes when I leaned it out for about 10 seconds then ran it down to a high idle again. Just for curiosity, I reduced the throttle trim from high idle to a very slow idle of about 1800 RPM. It stayed there idling along very nicely.
I can vouch for that. When I was review the OS 75 AX (it's one better than your "74" Chuck
) I broke it in on the test stand. I primed it until fuel reached the carb and the then the engine started on the second flip. First tank of fuel and it would idle reliably at 2500 rpm with no problems. I'm really impressed with this new engine.
Ken