I own a 1979 Arctic Cat Lynx and i was wondering what the ratio of gas and oil are suppose to be. It says on the tank 50 gas to 1 oil, but it also so 20:1 other oils. So what should the ratiio of gas to oil be mixed at??

I would just mix it 20:1. To much oil won't hurt but not enough will. It may smoke a bit or foul the odd plug but that's alot cheaper than an engine rebuild!! Hope this helps