You are looking at 50:1. Hope that helps.
50 to 1 ratio
50:1
Regular gas
349lbs
300
about 300 lbs
The 1990 model, 90 hp Evinrude outboard can use either an NGK BR7HS, or Champion L77JC4.
The listed dry weight for a 1999 model, 90 hp Evinrude outboard is 319 lbs.
The dry weight of a 1993 model, 90 hp Evinrude outboard is 301 lbs.
Any car or motorcycle that is a true "TOP FUEL" vehicle, uses a mixture of methanol (alcohol) and nitromethane. The current NHRA rules allow for a mixture of 90% nitromethane to 10% alcohol.
If you are not using an "exotic" fuel, I would say 50:1 with a name brand oil.
1964 90-S Starflite