Even with a 2 piece mount there is not enough clearance for the .61. They rate this plane for a 46 to 60 engine, but I don't see any way to get a 60 in there. It may have to do with the goofy detachable firewall they use. Thanks for the help guys - I changed to magnum 52 2 stroke and mounted it as far back as I could on a 2 piece mount. Had to bring the fuel lines out next to mount as suggested. Still not really enough clearance, but it will work. I hope the 52 is enough motor for this thing. I believe it's going to turn out to weigh close to 7.5 lbs on floats. Thanks again. (NO MORE VMAR FOR ME) .