ORIGINAL: Dicky168
But someone told me that there is really an aftermarket parts for the piston, liner and muffler to make the engine high performance.
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If so, I haven't heard from them lately.
Damned bad memory! There was an outfit that manufactured custom piston/liner sets for many engines, but they have been out of that business for a while now. I believe the name was Dave Shadell, or something similar. Can't get a grip on it at the moment.
The OS .32 series of engines are pretty hot in stock form. My OS .32F-H (ringed) was one of my all time favorite engines. I owned a few of the SX heli engines (ABN), but never got around to using them before unloading my helis. Which series do you have?
Ed Cregger