I have an Evolution 40 and my buddy has a 46. They are both easy starting, powerful, great running engines. The only probems we have had are: His was very hard to start when it was new and would stall when the throttle was advanced, we eventually found a loose screw on the needle valve that was letting it suck air. Tightened it and everything is fine. Mine had a cracked fitting on the needle valve. It broke off when I was removing the fuel line. The only problem here is that the fitting is metric and all I could find at the LHS were standard thread. I finally stole one off an old Super Tigre I had laying around and it fit fine. Problem solved. I won't hesitate to buy another.