I was very tempted to buy one too but it's not long since I bought the new 60-IIIB. I've still got my old 6001 .45BB that I used back when I was into serious stunt and it was at least as good as the ST 46 that most of the others were using. My fuel was just 75/25 all castor and once a year or so I'd take out the piston, give it a good clean and put it back in again. After 4 or 5 years ( and I'd guess a couple of hundred hours) it wasn't starting first flick anymore so I gave it a new set of rings. Back to being a new engine again for a few dollars .