I've been chasing down a loss of power problem at WOT and am still stumped. <br /><br />Symptoms: At WOT on the water under load it seems to be running on 1 cylinder in terms of power. Motor sounds fine but just is bogged down. It seems to run fine at in the test tank in gear WOT.<br /><br />I've checked the fuel pump and it seemed ok and put clear hose from fuel pump to the carb and no air seems to be getting sucked in. I have not put in a new fuel pump diaphragm yet, that is on order even though the old one seems fine. I cleaned out the filter on the fuel pump and thought that was the problem but it wasn't.<br /><br />The top cylinder, it's a two cylinder is running hot according to the plug and bottom one burns ok. This concerns me. Is it a fuel problem of not enough fuel getting to the top cylinder but the bottom one by virtue of gravity gets enough?<br /><br />Carb was suposedly cleaned recently by the mechanic but maybe this is still a problem in fuel delivery.<br /><br />Motor seems to pee ok but I'm checking the water pump tomorrow.<br /><br />Another thing I noticed at WOT under load on the water is the lower exhaust seems to shoot out a lot of air on top of the prop on the lower exhaust seeming like it causes cavitation which I don't recall if it did this before it started having trouble but an underwater stream of shooting bubble seemed a bit extreme.<br /><br />There's the bloody details...I've posted before on this one before and continue to work through the problem hopfully.<br /><br />I do have an electronic conversion ignition kit on order to help eliminate anything there.
