First test run up of this Yamaha Apex (snowmobile) Genesis 4-cylinder FI 150HP (YG4) air boat, what many might know as a "swamp boat". Conversion kit by Mohawk Aero Corps, contact us through our webpage for more information: www.MohawkAero.com. These water cooled 4-cycle engines only weigh ~120 lbs, about 170# all-up, installed, ready-to-run except battery.