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1986 Yamaha 25hp Ignition or Fuel Problems
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<blockquote data-quote="nccatfisher" data-source="post: 472650" data-attributes="member: 10811"><p>That slight miss @1500 may be the "spot" where it is transitioning over from low speed to high. All engines do it, Yamahas for some reason are more pronounced, most in the 25 HP range is right at 1200 RPM.</p><p></p><p> When you say it has a "miss" that is kind of generic. It would be nice to know if it was electrical. You could probably put it in a barrel and put a hose in there and you will get wet but put your air gap tester on it and run it at 3K RPMs in gear and tell if it was electrical. If not I would go back to the carb. Given you are running the mixture screw at 2.5 rounds out I would be suspect that the carb may still be the issue. I would say a thorough deep cleaning with an OEM kit installed may be a worthwhile endeavor.</p></blockquote><p></p>
[QUOTE="nccatfisher, post: 472650, member: 10811"] That slight miss @1500 may be the "spot" where it is transitioning over from low speed to high. All engines do it, Yamahas for some reason are more pronounced, most in the 25 HP range is right at 1200 RPM. When you say it has a "miss" that is kind of generic. It would be nice to know if it was electrical. You could probably put it in a barrel and put a hose in there and you will get wet but put your air gap tester on it and run it at 3K RPMs in gear and tell if it was electrical. If not I would go back to the carb. Given you are running the mixture screw at 2.5 rounds out I would be suspect that the carb may still be the issue. I would say a thorough deep cleaning with an OEM kit installed may be a worthwhile endeavor. [/QUOTE]
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