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I have 98 90 hp Yamaha. Bought it used a few years ago. It has always been rough at the low end of rpm's. When it gets above about 3500 it runs like a dream. Carbs have been soaked 3 years running. Yam mech went for ride and said it sounded like engine was dropping a cyl in the low end range, but he had never seen the problem before and didn't have any other solutions. Question is: can a firing coil act like this before it goes completely dead?
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outnumbered,
I would not expect the coil to act up as you have described. What do you mean "carbs have been soaked three years running"?
I would do a shock treatment with Seafoam on that Yammie three banger if it has not been de-carbonized in the last three years. Put in new plugs and run a can of Seafoam in tank of 16 gallons of fuel. If that doesn't help, then carb rebuild may be in order.
Good luck,
Ken K -
Thanks for your reply. Carbs have been taken off as a yearly service and soaked to remove any gum-- however, no other rebuilding. Is the seafoam a product available at outlet such as West Marine? There has been no decarbonizing in the 4 years I have had the engine.Comment
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outnumbered,
I purchased Seafoam locally at Advance Auto, but I think most major auto supply stores carry it.
Good luck,
Ken KComment
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