The best outboard engine available now is the Evinrude V tec, it is a two stroke, and the cleanest running engine to date. The 4 stroke OB are all extremely heavy. It is sad that the only 4 stroke that is desirable is the Whizzer, and now not available in a kit form. The weed whacker converted 4 stroke engines don't fit well and there looks are barley acceptable at best. I still think it could be done to replace the current happy engine to 4stroke configuration. All the drive, crank and ancillary parts could be used, we would only need the cam parts and the castings to accept the rest of the 4 stroke. It would use the barrel with-out the ports, and oil control ring on the piston, 1 compression and 1 oil ring, and a new head with the ports. The best cam would be a OHC outfit, with a small cog belt or chain drive. Driven from just inside the Mag. Have fun, Dave
PS: Has anyone heard about the 4 stroke that takes an oil mix and no crank-case oil? (IE no crank-case).