Last weekend we pull Grandpa's 1968 Starcraft out of the barn.  Time to get it up an running.  My first project is to get the motor tuned up.  BRP.com had the complete breakdown of the motor.  50:1 ratio gas mix.  Did read that 24:1 is a better mix.  That's for another post.  Bought new spark plugs but don't know the gap setting. It has a grease zert on the lower unit.  Will grease.  

Anyone know a good site with info?  Anyone know gap setting?  Were else should I grease?  Thanks!  

Those old johnson 6hp are great little motors. They last for ever. I have a 1967 & and it runs great. I use it as a kicker motor. a few years ago I lost the hood for it, well to find another took a year. everywhere I went they had running motors, not parts most places said "those motors don't break" I'm sure they do, but the seem to run good for a long time. have had mine in the family, since 1980 and have not had one problem.

On gas mix. 50:1 not 24:1. as for plug gap. don't know I just put new plugs in and it will run fine. The plugs I found to work the best are Champion. Infact mine has sat for 2 years. a friend borrowed it last week and it started on the 3rd pull and ran great for him all weekend

I set the gap as close as I could to the old ones.  They were the original AC Delco plugs from 1969.  I read in an article about the 50:1 vs 24:1 fuel mix.  I was told that the 24:1 is too rich but would not hurt to go in between the two.