For me it's Kawasaki Racing Oil mixed 32:1 that does it! I even run it in my 1996 Polaris SLX780 (778cc Triple-Cylinder 2-Stroke) Jet-Ski...except in a 50:1 ratio, since that's what it calls for. As soon as my triple-pipes get here, my HP will go up from 96HP to 138HP...and I should finally reach the 80mph mark!
Edit: This is what it will look like some day when I can get the correct parts & pieces.