Opjose, that is the truth. I cut my teeth on four strokes with a Magnum 52. I picked up an O.S. 52 and found it easier to tune. My first Mag 70 about drove me nuts getting it running the second day until I discovered that you started your idle mix differently that either the Mag or O.S, in that you screwed it out to a stop, then screwed in the recomended number of turns. Once I dialed it in, it has been a great running engine even with a couple of nasty ground contacts. I also have a couple Mag 91's.Same great running engines. Almost like your car,hit the starter , let it warm up a bit and away you go. Iseldom had to touch the mix untill the last of a jug if I hadn't been flying a lot. Irecently aquired a few large Saitos and was really susprised a the wide sweet spots on both needles compaired to either the Mag or O.S engines. They also seem to idle much better, to the point that shutoff isnotinstant like the O.S and Mag engins are. I'm guessing that as there isn't a throttle stop, that the rotate pin isn't allowing the barrel to fully close. They seem to want to set there and tick over at what seems like about 1K for a long time until it finaly quits. Don't carry my tach to the flight line, so I'm only guessing the RPM. I know it a lot slower than the 2K I tune to for idle.

Don