Hey,

Just an FYI, a friend e-mailed me this thread.

I thought I would mention if you take out the baffle in the TT46PRO muffler (commonly done to get more power), it is physically impossible to 4-stroke this particular engine.

Most NIB engines today will not run 4-stroke for any significant amount of time without a constant application of the glo-starter. So a big hint, when you are breaking in an engine, is if you keep the glo plug on just so you can break it in, well then you are running a little too rich.

Hopefully this clears things up without going into the techno-babble.

Of course, once an engine gets loose and is broken in well, you can 4-stroke it quite easily by richening up the high speed needle.

I am a real lazy *******. My preferential method of breakin an engine in, is to run it for half tank rich until it runs semi-reliable. After that, I am done. I fly the plane/heli with the engine rich. After many weeks/flights later, until I can't stand the lack of power, I start to lean it out a little at a time.

The idea here, is to give an idea of what is 4-stroking rich, and 2-stroking rich. On an OS46FX, 1.5 turns out from optimum is stinking rich but still 2 stroke, 3.5 turns out is 4 stroking. On an TT46PRO, from optimum, 2 turns out from optimum is stinking rich, 5 turns out, and it's stinking rich and still 2 stroking, 7 turns out and it starts to 4 stroke, without the baffle, and it simply won't 4 stroke.



Jimmy