If you have removed your oil pump and gone pre-mix, these are the correct ratios you should be mixing to, after the first tank of break-in. These are the stock ratios the factory pumps put out at WOT:

32:1 = 4oz/gal
40:1 = 3.2oz/gal
50:1 = 2.5oz/gal

Sea-doo
40:1

Yamaha
All but 800 & 1200pv 50:1
800 & 1200pv 32:1

Kawasaki
50:1

Polaris
40:1

Tigershark
40:1