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    Why 50:1 and not 100:1

    In a recent post someone inquired about whether his older motor was 100:1 or 50:1? One reply said, "We've all gone back to 50:1 anyway..."<br /><br />Did I miss something? I have a 1991 Yamaha 4hp that is rated for 100:1. Is there a rule of thumb that when running an older motor you should...
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    Yamaha 4hp - Water Temp Leaving Engine?

    After a couple of years of sitting idle, I finally rebuilt the carb and replaced the water pump in my 1991 4hp. The old impeller was disintigrated, and small pieces were everywhere inside the housing.<br /><br />I cleaned out the housing and installed the new kit, and all went well.<br /><br...
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