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Brand new 9.9hp yamaha oil mixture question
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<blockquote data-quote="Pappy" data-source="post: 200823" data-attributes="member: 3278"><p>Back in the late 80s OMC (Johnson and Evinrude) had a range of engines that were advertised to run on 100:1 ratio for around a year or two. What was found was that most engines were not run frequently enough to keep the engines protected during the down time. Not enough lubrication was left on the rotating parts to keep rust and corrosion from occuring. A Service Bulletin was then issued urging all dealers to inform owners to switch back to 50:1 rato for the duraton. Your Yamaha is built using the same basic materials and is exposed to the same environment so the best advice that can be given would be to run the engine on a minimum of 50:1. Additional benefits will be longer engine life due to reduced internal wear, a touch more power due mainly to better sealing, and peace of mind knowing you have internal parts that are better protected during times of non-usage. To put it another way..........I have never seen an engine fail from too much lubrication.</p></blockquote><p></p>
[QUOTE="Pappy, post: 200823, member: 3278"] Back in the late 80s OMC (Johnson and Evinrude) had a range of engines that were advertised to run on 100:1 ratio for around a year or two. What was found was that most engines were not run frequently enough to keep the engines protected during the down time. Not enough lubrication was left on the rotating parts to keep rust and corrosion from occuring. A Service Bulletin was then issued urging all dealers to inform owners to switch back to 50:1 rato for the duraton. Your Yamaha is built using the same basic materials and is exposed to the same environment so the best advice that can be given would be to run the engine on a minimum of 50:1. Additional benefits will be longer engine life due to reduced internal wear, a touch more power due mainly to better sealing, and peace of mind knowing you have internal parts that are better protected during times of non-usage. To put it another way..........I have never seen an engine fail from too much lubrication. [/QUOTE]
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