If it isn't on the tank, I wouldn't know where to even find it! The old oils used to be anywhere from 32-1, 40-1 or 50-1! I would use a good oil at 40-1 to start with and if the plugs don't show oil deposits go up to 32! If they foul easy then down to 50!
I had a 79 whip my buddy a sting we both ran 40 to 1 mine burnt 8 pistons+ spit out seals my buddys sting ran for years+years trouble free, just read the plugs on the first tank of fuel to be sure,clean the carbs on that sled if it has set at all!!!
__________________ 1992 Ski Doo Mach 1 (SC-10/2 suspended) March '07 SF.com Sled of the Month! (Lost in fire 4-7-13)
1992 Ski Doo Mach 1 original 2006 Ski Doo MXZ 500SS
1999 Ski Doo MXZ600 Webmaster Evergreen Valley Snowmobile Club SledNH.com Moderator