Ed, I bought my first two ASP 108 Redheads from Indy RC way back when.....probably early 1990s. I ran the extra head shim and ran them on 10% fuel. With a Slimline Pitts muffler the engine would not richen up, even if you removed the high speed NV and held your finger over the hole. It was fine with the OS 61 size muffler, which added back pressure. And the OS carb made a well-behaved engine out of it. In more recent years, I bought a newer (Series 3) ASP 108 from Just Engines in England, and the carb was much different, and it has run fine. I also have two Magnum 90 two strokes, one the OS FSR copy, and the other the newer OS 90 copy, and both are user friendly engines. My Magnum 50 (52?) is a real honker too. I think the Chinese were doing ok with their engines, I have a GMS 47, and two Tower 75s and they are all well behaved. Too bad the Tower 75 in no longer imported, it was one of the finest buys out there.

Clair Sieverling