Re: info needed on 59' 18hp Evinrude Fastwin
Plugs are champion J4C gapped at .030" (.75mm). Yes, the mix is 24:1 87 octane gas to TC-W3 rated outboard oil. I belive that the 18hp did not get it's wrist pin bearings changed from plain to roller until '61, so I would stick to 24:1. The extra oil is needed in volume for those bearings so the quality of the oil isn't really much of an issue. That is to say, just using a superior oil doesn't let you switch from 24:1 to something lighter.<br />Many have gotten away with running those at 50:1, but if it were mine I would not. There's no real compelling reason other than smoke, and synthetics can help with that (at the regular mix ratio).
