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    Pennzoil-Walmart

    We stopped by Walmart in Amelia Island, Florida this weekend to buy some Pennzoil 100% Synthetic Outboard Motor Oil, which is usually $27/gallon, the guy confirmed that Walmart would not be carrying the 100% stuff any more, only the Synthetic Blend. He had his Pennzoil 100% on sale for...
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    antique outboard motors!

    Holiday visit with family in Tallahassee, fl., too cold to fish, went to the local Tallahassee Antique Car museum, found they have over 200 mint condition/restored antique outboard motors, Watermans, Evinrudes, Mercurys, Johnsons, many brands I've never seen or heard off, a really great thing...
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    Surface Gap Spark Plugs?

    I've always used the NGK B8HS10 spark plugs in my 90HP Yamaha with no problems, but read occasionally about these surface gap plugs without the "hook-type" ground electrode, and just wondering what is the advantages or disadvantages of these plugs? I believe some airplanes use surface gap plugs...
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    water pump test?

    I did a routine water pump impeller replacement on my 1999 Yamaha 90C a couple of weeks ago and everything went fine and motor is peeing like normal. Can I effectively test the water pump/cooling by running on muffs, in a barrel, or do I need to take the boat to the lake to be dead sure? We're...
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    new water pump!

    Finally got up the nerve to replace the water pump impeller on my 1999 Yamaha 90C yesterday, and have to admit that it really wasn't the tough job I thought it might be, especially after getting all the instructions, tips and information from all the guys on this forum.....I really appreciate...
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    Best Bolt Sealant?

    I'm doing the water pump replacement on my 1999 90HP Yamaha and wondering which sealant for those main bolts that holds the lower unit on? I've heard marine grease, spline grease, Loctite, teflon pipe compound, anti-seize compound, etc. Which one is the best? Thanks for your ideas on this.
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    spline grease

    O.K., got up the courage to change the water pump impeller on my 1999 90C Yamaha. Some instructions mention "Yamaha Spline Grease". I have plenty of Spray Lithium Grease, Green Marine Grease, Heavy black CV Joint Grease, but no specific "Spline Grease" for the drive shaft splines and shift shaft...
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    speedo tube

    In dropping the lower unit to replace the water pump impeller, it says to cut the speedo tube and then replace it back on re-assembly. I don't use that speedo tube or even have a speedometer, so would it be O.K. to just plug that tube or tie it off. What's the purpose of it being there? Thanks...
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    99 Yamaha 90 motor flush

    My 1999 Yamaha 90C is mostly freshwater but ran it all last week in salt water at the coast and was thinking of flushing motor with 30 gallon drum of fresh water with maybe a gallon of vinegar for 30 minutes, then neutralize with some baking soda. This would be a mild flush but might be good to...
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    99Yamaha fuel pump

    Well, I broke down and bought a new fuel pump for my 1999 Yamaha 90HP 2 stroke. My old pump is still working fine but my question is this: go ahead and put new pump on and keep old pump for a spare or wait for old pump to die? You guys got any ideas on the life of these pumps? Thanks for any...
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    90C fuel pump replacement

    My 1999 Yamaha 90C 2 stroke runs fine, never replaced the fuel pump. Should I buy a new pump and put it on, keeping the old pump for a spare, or buy a new pump and keep it in my tool box and wait for original pump to wear out/die, or just forget this and assume the pump will keep on running...
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    outboard problems/opinions

    I'm talking with a friend about our outboard motors and I suggested that about 70% of problems are fuel related, 20% are electrical and maybe 10% mechanical. Do any of you experts out there have any quantitative ideas about these figures? I'd bet Mr. Rodbolt would know about this. Thanks for...
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    90HP Yamaha compression ratios

    My 1999 Yamaha 90C has compressions of 5.76:1 on cyl.#1, 5.67:1 on cyl.#2 and 5.86:1 on cyl.#3 as per the Yamaha book. I'm certain the bores and strokes are the same for each cylinder, so the only variable can be the port timing. Does anyone know why these compression ratios would be...
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    1999 Yamaha 90C alarm test

    trying to test my alarm horn to be sure it works, tried cranking on motor with stop lanyard removed, but no horn. any easy way to get the horn to sound just for test? Thanks for any help!
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    Locktite or Anti-Seize/

    I've always used the silver colored anti-seize compound on marine bolts to prevent corrosion and breaking off studs in blocks and other "stuck/broken bolt" type problems. I notice the Yamaha Repair Manual mentions Loctite thread sealer for certain bolts. Any opinions on which of these is the...
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