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Brand new 9.9hp yamaha oil mixture question
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<blockquote data-quote="cincinnati" data-source="post: 200870" data-attributes="member: 5561"><p>A 100:1 oil ratio is suggested for environmental purposes only, since everything that passes through the engine is exhausted into the the water & the smoke is "unsightly." </p><p></p><p>I'm old enough to remember when many 2 strokes ran on 30:1. Many racers & builders would have run even more oil IF the ignition would've tolerated it. 50:1 may have been the optimum for lowspeed operation w/reasonable plug life. </p><p></p><p>If you're troubled by the smoke, want to save money on oil, or don't believe that there is a long-term mechanical benefit to a little more than a tablespoon of oil per gallon, then run 100:1.</p></blockquote><p></p>
[QUOTE="cincinnati, post: 200870, member: 5561"] A 100:1 oil ratio is suggested for environmental purposes only, since everything that passes through the engine is exhausted into the the water & the smoke is "unsightly." I'm old enough to remember when many 2 strokes ran on 30:1. Many racers & builders would have run even more oil IF the ignition would've tolerated it. 50:1 may have been the optimum for lowspeed operation w/reasonable plug life. If you're troubled by the smoke, want to save money on oil, or don't believe that there is a long-term mechanical benefit to a little more than a tablespoon of oil per gallon, then run 100:1. [/QUOTE]
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