by changing the jets. It's been a few years of cruising now and it's getting a bit tired. A friend has an 8 Hp Yamaha Enduro he would like to sell me but I can't find any cross over jets for the Yamaha. It's one of those deals that I really don't want to pass up. As it stands now my old modified Nissan beats the hell out of the Yamaha. Has anyone done a HP increase modification of an 8 Hp Yamaha? Right now the Nissan will get both my wife and myself with all our skin diving equipment with a full tank of fuel up on a plane with no trouble. The Yamaha isn't even close but it's almost to good to pass up.