I just winterized my 1989 yamaha 150 2 stroker, I had about 12 gallons of 93 SUNUCO left in the tank , I added 5 gallons of 105 octain racing fuel ( no ethanol) 2 pints of Sierra Combustion Cleaner and 4 oz. of stabil. this mixture has always worked for me now for 8 yrs. I ran this mixture for 5 minutes off my garden hose to get in into my water seperator and carbs. then ran the foging oil thru the plug holes to lube the pistons and rings , drained the carbs ran it again to get the carb foging oil into them . DONE
execpt for the lower unit , I always use racing fuel it is expencive but worth it
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