The new "Carbon 90" drive system utilizes a carbon fiber timing belt, precision adjustable idlers, andanew drive frame design, allowing for the increased powerof the 40hp Kohler engine. It increases drive efficiency,maintainslow center of gravity,eliminatesbelt covers, touch blocks and idlers, all withno slippage. Testing of the drive on two different craft have shown the system to be reliable and substantially increases performance.The increased thrust gives a top speed of 40mph, allows for increased head wind capability, acceleration and payload.The recommended hull size for this configuration would be 15 x 7.5 ft or 16 x 7.5 ft. This wouldallow for payload of1,100to1,200lbs. You can buy the drive kit, engine frame, and the propeller guard. We offer many different levels of fabrication.