I have a two stroke 9.8, long shaft, electric start 2002 Nissan on my 22 classic and it has many hundred trolling hours and is still on the same spark plug. It has underwater exhaust, is quiet, does not load up, no oil sheen and starts instantly. (no smoke).
Will troll at 2mph for eight hours on three qts. of gas. Run it dry in the fall and it starts right up in the spring after sitting for six months. It weighs 65 lbs.. I would buy another one in a heart beat,but I don't think their make it anymore. Got it from Cabelas frieght paid and no sales tax $1600 bucks. One of my better buy's. C-Otter