ORIGINAL: flybyme
os 46fx break-in, being a newbie I read the manual on engine break-in......I was kinda confused that the instructions said to run it at full throttle on rich mix (four cycle sound), for ten seconds, then lean it out to two-cycle sound for ten seconds and repeat this procedure until you run a tank of fuel----back and forth every ten seconds.........I hear there are different methods of running-in a new engine.........I just want to know is this the preferred method....
flying is like breathing, everybody should do it........
Dave's method will work fine.
Now as to WHY OS recommends theirs. When you lean the engine it runs hotter than when it is rich. By doing it the OS way you do a number of temp cycles on the engine which aids in seating the piston to the sleeve.
OS did not take the time to write their manual just because some writer had nothing better to do one day. OS must believe THIS is the BEST way to break in their engine. They've probably only built a couple million engines, but I'm betting on them.
