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    speedo tube and lower driveshaft bushing problems

    the speedometer on my boat stopped working halfway through last year.thought it was just gunk in the tube and didn't check right away.when i had time i disconnected and the tube and blew it out.couldn't be in two places at once but could here the air so i thought the problem was solved.go out...
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    injector cleaner

    Hi there Does anyone know if it would help or hurt to run injector cleaner in a 2006 merc 4s in the first tank of the season? Thanksd:)
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    which prop won't screw up a good thing?

    I have a merc 90 4s with a 17p x 13.25 prop on a lund prosport 1700.The rig weighs in at about 2500 lbs.the altitude here is 3500 feet but we vacation at a lake at 2400 feet.My hole shot is good,and so is top speed.rpm is 5400 at wot.motor is rated for 5000-6000 rpm range. I want an...
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    right oil for new 90 4s merc

    Doing end of season service on a new 90 4s. The service manual reccommends 25w40 except in low tempertures below 40 F and then they say to use 10w30. I don't go out below 50 F.I would rather use the manufacturers preference. My problem?Argued with a master mechanic over the grade of oil to...
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