Here's a stupid question (okay, so the only stupid question is the one you don't ask . . . I didn't ask this soon enough):

How do you tell the difference between an ringed and ABC engine? I followed the directions that came with the engine to the letter when I broke it in. I didn't even consider the possibility that the manual might me wrong. Although I don't know why; I work in IT and every manual I read has at least one, huge error in it.

I have a OS .46 FX and the directions stated to set the needle valve to certain position, set the throttle to 25% and start the motor. Then I brought the motor up to full throttle and opened the needle valve until the engine went into "4-cycle mode" and held it for 10 seconds, then closed the valve until the engine went into "2-cycle mode" and held for 10 seconds. I repeated this until I emptied one tank.

When that was complete, I refueled and started the engine with the needle valve in the initial start position and throttle at 25%, and then set the needle value to where it "just breaks into 2-cycle operation" and ran the motor between 25% and 75%, with an occasional run up to 100% (couldn't help myself; I had to bother the neighbors a little ). I did that for one tank while I practiced taxing.

At the field, other than adjusting the idle valve, my instructor said the engine was fine and it started on the first crank every time. But, have I screwed my motor up?