Took her out yesterday for the first time this year after i just rebuilt the carbs. Ran her at home, everything perfect. Got onto the lake, helped a guy at the dock (his battery was dead after he just got it back from the dealer being serviced and i happen to have an extra battery, go figure),started the ol' merc right up, idled around a little, got her good and warn, checked the tattle-tale - flowing good, then chugged out of the no wake zone then goosed her full throttle and she ran like a champ. I was heading into the wind and it was a little choppy so i backed off the throttle, swung her around and goosed her again. She took off fine and got up on the pad for about 10 seconds and then all of the sudden she backed down like she fouled a plug or two. I thought it was strange to foul a plug since i was running WOT for 2-3 minutes total but i had no power what so ever. So after being on the water for about 20 minutes, i idled back to the dock and put her on the trailer headed for home. Once home, i put the ears on and same thing...no power. Checked the plugs, carbs, blahblahblah..all ok. I started pulling the wires off the plugs one by one as she ran on the ears and realized the one side of the motor has really weak spark and doesn't make much difference when i pull the wires off. When i did it to the other side, cly 2,4 &6, it made a big difference. And the spark coming off the wires as i pulled them off the plugs where much stronger on 2,4 & 6. I know this motor has two switch boxes, one for cyl 1,3 & 5 and one for 2, 4 and 6, but i really want to be sure that this is the problem before i drop $200 or whatever they go for. My Solec (horibble) manual doesn't tell me how to test the switchbox but tells me how to test everything else....stator, trigger, control box. I'm guessing i should just swap the switch boxes and see if the problem follows it but it just seems sort of odd that one of then would just "sort" of die. It still throws spark, but not strong spark and i guess under power, it's not strong enough to ignite those 3 cylinders. I guess i figure if one of thise bixes is going to go, it's either going to work or not work at all, not "kind of" work. If anyone has ever experienced something like this or may have any other idea of what could be wrong, any help would be appreciated.<br /><br />Thanks in advance - Jersey