I JUST BOUGHT THE U-CAN-DO 60 AND ORDERRED A OS 1.20AX TO HAUL THIS BABY VERTICAL. THE SPECS FROM OS REGARDING 2 STROKES FOR THIS AIRPLANE ARE - 1) .91FX - 2.8HP @ 15,000 RPM'S / WEIGHT= 19.3 OZ. 2) .95AX - 2.9HP @ 15,000 RPM'S / WEIGHT= 20 OZ. 3) 1.20AX - 3.1HP @ 9,00 RPM'S / WEIGHT= 21 OZ. = NOW WITH THAT INFORMATION, I COULDN'T SEE ANY REASON TO NOT BUY THE 1.20AX. IT'S SIZE IS ALMOST IDENTICAL TO THE .91FX, WEIGHS 1.7 OZ.'S MORE, AND GIVES ALMOST 1/3 OF A HORSE, MORE POWER !!! THE GAVEL HITS THE SOUND BLOCK AND "SOLD" !!!! THE 1.20AX ALSO COMES WITH 2 ADAPTERS AND THE MUFFLER. I BOUGHT MINE BRAND NEW FOR $255 SHIPPED W/ TAXES. IF ANYONE HAS SOME PICS OF THIS ENGINE INSTALLED, WOULD YOU PLEASE POST OR SEND THEM ??? ALSO, HAS ANYONE HAD A FUEL LEAKING PROBLEM WITH THE ENGINE MOUNTED UPSIDE DOWN ? NOT SURE IF THAT'S AN ISSUE OR NOT. THANKS !!