RE: KMP / YT FW-190 Build Thread
Simon I love the OS 4strokes and have 8 of em none as large as the 200, mine are 91-120's but one thing I do is,I run them up on the high end to peak RPM and then richen them up so they run about 300 RPM off peak, this helps when the plane is flying and the prop unloads so the engine doesn't lean up too much.
one of the 4stroke guys at my club told me to do this, and my engines run like a sewing machine,I fly near the coast in the bay area which helps but even on hot days the engines don't heat up too much.
I also don't go crazy with leaning out the low end either as long as the engine idles slow enough to land its fine