I have a Yamaha G1 with a 454 Rotax snowmobile engine in it. This engine is a true screamer and is in good shape. It is an aluminum engine and is 2 cycle. It is water cooled, 2 cylinder with a rotary valve system, twin Mikuni carbs, and turns as high as 14000 rpm. It has a primer for starting instead of a choke and I am just now mastering the skill needed to start it without flooding it. It is an easy starter and once it is warmed up it screams like a banshee. It has 145 lbs of compression. This rig comes with an extra engine which needs rings and crankshaft seals but that is a very simple project. I have had this cart to 65 mph myself and my neighbor swears he has had it to 85. Personally I wonder about anyone who will run a machine this size at 85 mph, lol. I was asking more but I am willing to take $2250 for this beast and will consider an interesting trade for all or part of the price.