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    1987 Yamaha 90 ETLJ pulser test valid?

    Hey Folks, My #3 cylinder has very weak spark, and seems to only fire once RPMs get up around 4000 or so. Tried swapping coils & plugs, but problem stayed with #3. Seloc manual has resistance test that states 1 pulser should read 350-420 ohms resistance, while the other pulser should read...
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    87 Yamaha 90 ignition wires?

    Hey folks, My ignition wires are working themself off the plugs while running down the lake. I was planning to change the wires, but it appears that the ignition wires are permanently connected to the coils. (I can't figure out how to replace them without replacing the coils. Am I missing...
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    Sonar question to think about...kindof long

    My Garmin fishfinder manual mentions a 'dead' spot which occurs when a fish or structure is below the highest point of 'ground' within the sonar 'cone'. Since the first strong reading is interpreted as the bottom, it can't see anything below that point. No big deal on a hump, because...
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    Props --- Diameter -vs- pitch?

    I'm looking to replace my aluminum stock prop with a set of Hustler props. I'm currently running a 13.25 X 17, which will peak at about 5600 RPMs (Max should be 5500). I'm wanting to move to a 19" for cruising / speed, and a 15" for skiing or slower trolling, but they only have the 15" pitch...
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    Safe to check compression w/out grounding plug wires?

    Is it necessary to ground the plug wires, and if so what's the easiest way to do it (w/3 cylinders)?<br />I'm thinking maybe it's not that necessary since I've seen posts from knowledgeable folks recommending pulling plug wires while the engine is running...isn't that about the same thing...
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    Better manual --Seloc or Clymer for '87 Yamaha 90?

    I'm no pro--good explanations and illustrations are most important to me. I'm not planning any rebuilds, just basic maintainance / maybe carb rebuiilds, etc.<br /><br />Thanks for any recommendations!
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    NGK B8HS -vs- B8HS10? What's the difference??

    Owner's manual says us B8HS10. Has B8HS installed. Is one hotter than the other?
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    Couple of Decarb questions...

    Sorry, I know this decarb horse has been beat to death, but...<br /><br />Does the smoke plume indicate that there's still carbon being removed, or will Seafoam cause smoking even in a carbon-free engine? I ran about 1.5 gallons of gas/seafoam through (at 1 can seafoam per gallon of gas. I put...
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    Tach troubleshooting?

    Last trip out, my tach started acting up (jumping erratically) although the engine sounded normal. It did it at idle, and at least through half-throttle. (It's jumping as much as 2000 RPMs.) Once I reached full throttle, I didn't notice it jumping. The water was pretty smooth the entire...
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    Opinions on good Aluminum prop

    I'm running my stock 'spare' prop on my Yamaha 90 / '87 Ebbtide fish/ski since my last 'stupid human trick' (forgetting to trim the motor up at the ramp). I'm a casual boater / fisherman / tube puller (once a week or so), and I don't want to spend $300 for a stainless prop, but I'm thinking of...
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    Where do you get Yamaha "Ring free" additive?

    I've read good things about this stuff for removing carbon buildup, but I couldn't find it anywhere online for sale. Anybody know of a good source online?<br /><br />Also, I'm new to the world of 'pouring money in a hole in the water'. I have an 87 Yamaha 90. At initial cold startup, it idles...
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