I been asking for a few months now. I have been useing a 50:1 mix and it has been smokeing and fouling out my plugs I think. I also would like to know where I could get a manuel for a 1963 MERC. 500. I looked in stores and online but couldn't find one. I been looking into some other post and I have been putting one quart per 6 gal. Is this correct????