I just put a 701 out of a waveraider in my superjet and it has a msd enhancer and protec pipe. When I put it in the water it will run good for a couple minutes and then just cut out and not go above 1/4 throttle. I hooked the gas line from the gas tank right to the carbs and took the breather line off the gas tank so I knew it was venting and it still ran like junk. It seems the longer I let it sit the longer it will run good before it cuts out. I tried messing with the mixture screws but it doesnt change anything.