You guys have help with some problems on our 200ox66 just from reading other post, but now i have a problem with my fresh water boat a 1988 115 Yamaha carbs have been clean 2 times, not by me i might add, i know better, the problem is after it sets a week when you start it up it runs on 3 cylinders for about 400 yards then it runs just fine the rest of the night. Could this be the power pack? Its got a battery, new primer bulb, plugs and gas filter, old filter was clean nothing to show gas lines were breaking down. Thanks for any info. By the way this is a great forum with good information!!!