I just recently got this motor, and yesterday i took it to the lake to test it. it ran good in the barrel but when i would get it on plane it started to surge for some reason like i was giving it wide open throttle then no throttle. the whole time it was doing this i had the throttle wide open. it seemed to me like it wasn't getting enough fuel. when i got home the first thing i did was pull the fuel pump apart, it was leaking anyways so i thought it was the culprit. i was just gonna rebuild it but i found a new one for 46 dollars which is a steal compared to other places so i bought the new one. also, i took the carb apart to clean it but it seemed to be very clean. also, could it have had something to do with the cut-out switch? it didn't seem like it was dropping down and running off of one cylinder. sorry this was so long. please help!