I bought a Hobbico NexSTAR Select. It comes with the O.S. Max FXi 46 engine. Supposely, I thought, the engine was broken in at the factory. It has a limiter on the high speed needle that was set at the factory. However, the NexSTAR manual references running it rich while breaking in the engine. The manual does not cover the break-in procedure.
I have the engine manual that comes with the RTF kit. It says to open the needle valve to the advised starting setting and start the engine, then adjust so the engine doesn't stop. Run for one minute with throttle fully open but with the needle valve adjusted for rich, slow "four cycle" operation. Then close needle valve until engine sppeds up to "two-cycle" operation and allow it to run for about 10 seconds, then reopen the needle valve to bring the engine back to "four cycle" operation and run for another 10 seconds. Repeat this procedure until the fuel tank is empty.
This being said, with the needle valve limiter installed, full counterclockwise is "rich" and full clockwise is "lean." What do they mean by "two cycle" and "four cycle" operation? How do I tell the difference between the two? I read somewhere on this forum that you can tell by the sound of the engine.