Over a year's time, I bought a couple of the 40's used, for cheap, because everyone knew they were no good. Funny thing, when they were retuned and run on 5% fuel, they were great running engines. Guess I got lucky. Also bought a .48 (for cheap) which turned out to be an exceptional engine.Earlier, I had a 1.48 that was a strong, sweet running engine. That one I had bought new, and it did not disappoint.