Got a 2010 ( that's when I bought the boat) 50 ELPTO, 2 stroke, Ser #18761365, Mod # 1050412FD. I had it out on the water yesterday, cranks fine and idles fine. When I throttled up I was cruising at around 4200 to 4500 rpms when the engine just powered down to about 3000 rpms, didn't die it just powered down. Backed off the throttle and put in neutral, then powered back up to above 4000rpms, it held for about 5 to 10 seconds then powered back down but didn't die. I ran a long ways up and down river at just under 4000 rpms and it ran fine, but whenever I tried to go faster it would back off like it was some kind of limp mode. Water pump is fine, spark plugs are fine, I'm thinking it is fuel related, Several times when I'd throttle back up to over 4000rpms it would kick in and out of trying to throttle up, like it wasn't getting enough fuel. I am going to change fuel filter and see if that helps. Any advice would be of great help. PS.. It has a manual fuel pump, and like I said, it never died. I posted this earlier but no replies, also noticed that when I squeezed the primer bulb, I could see the fuel going into the filter then when I let off the bulb it sucks back out, gonna change the bulb out too