I aready have a moki 2.10 new in the box , Iwould love to have a BME 50 on my no.2 patty if i had to do over. The fuji 50 with a 20x10 pro zinger pulls patty good at 7400 RPM .rcguy your right 45.5cc. i have a b&b muffler with smoke. fuji 50 sb 4.2 lbs w/o muffler. all in all the fuji 50sb is a great eng. i would like to build the next patty with the tank on the cg . im using carben fiber rods, robart hinges , any other info would help. THANKS, YOU ALL HAVE A LOT OF NOLAGE HERE KEEP UP THE GOOD WORK.