Ah yes, yet another fine engine brand cheapened and brought down in quality. My first R/C engine was a ST G21 .40 back in 1977, and it was a precision instrument. The twin needle valve carb did take a little teaking, but it set up quickly and had a "tick-over" idle, perfect transition, and was quite powerful even though it was not Schernule ported. When ST went away from their familiar twin needle carb with the two needle valve which could be locked in position, the ability for the user to adjust and fine tune the engine went away. I had an Italian made G45 ABC which was flown five seasons before it needed the bearings replaced. The piston sleeve, which squeeked when new was still going strong. ST has become just another cheap Chinese import.....