How can i find out if my outboard is a Ignision miss fire or kicking out of gear?

-i have a video of it at a lake and i think it is kicking out of gear, but a macanic said it is a ignision miss fire, could some one look at my video and let me know? i say it is the cluch, but, well could anyone here help me? thanks charlie in newark ca.i'd start with pulling the plugs and looking at them. color and amount of deposits, if any, should tell you if both cylinders are firing evenly or not very quickly.