Does anyone know where I can get a service/repair manual for this motor online?  I dont mean buy it, I mean down loadable in an Adobe format?  Free would be best, but I can afford a few bucks.  I just picked up this motor on ebay, and need to learn how to use it.  I have never seen anything with a low speed fuel mixture control.  Can anyone help?

I know of no one that has pdf's on line.  A number of people have those old manuals for sale, (usually about $15) it's a matter of if they have the one you need or not.  Clymer is a source for generic manuals that cover a range of motors but can coast you $25.

Low speed mixture is for your idle.  Usually you will turn it CCW about a 1/8 to 1/4 turn to cold start it (provided it was set properly to start with) after it warms up and you plan to troll or let it idle for extended time, you slowly adjust it CW until it idles smooth without lean spitting.  Go too far CW and it will lean spit and cut the motor off so you go CCW again just a touch until it doesn't lean spit (lean spit is that little cough the motor makes)

If the mixture adjustments turn fairly free, you snugg the brass nut at the base of the stem until there is some tension on the adjustemts.

Thanks for the help, that got me running.  I am still going to need to find a manual to maintain her.  Is it worth getting the parts manual too?  There is a parts # manual available that I think might be handy, but I dont know.   Do you have any insight on that?

This only goes back to 1968 but doubt there's any difference between a 67 and 68 http://shop2.evinrude.com/ext/index.aspx?s1=59402f8a5f8bb026922fcf6246947d8e.  Click on the pull down that says EVINRUDE and select Johnson then go down to the 1968.