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    safer way of grounding plugs?

    What is the best/safe way of testing for plug sparks? Can any one part of powerhead be touched and what other safety precautions need be followed?
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    '78 Merc 800 just won't start

    A few weeks ago on my drive in after a day of towing a tube around my engine speed seemed awful low. I checked my fuel line and discovered that a piece of silicone was lodged in the connections. Upon removing this and cleaning my line I checked the fuel filter which was slightly dirty but...
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    Merc 800 speed died off

    Folks,<br />I have an 18'Starcraft V-hull w/ '78 Mercury 800 80hp and while finishing up an hour of tube pulling I noticed the boats speed would not climb over 20mph at WOT when an hour earlier I had it up to 32mph. I did not notice any shaking or roughness to the motor, and when back at dock...
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    '56 Johnson low/high speed needle valves

    My '56 Johnson 5.5hp has both speed valves (low and high) deformed at the cone due to overtightening. I'd like to replace if possible but havent't found a supplier who has these, only things I find carb related are seats and needles and the packing rings. Are there replacements available?
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    '56 Johnson 5.5hp impellar removal

    I have been slowing bringing back to life an old '56 Johnson 5.5hp after it sat idle for 10 years. I am not familiar with how the intake/exhaust should operate on this motor as my only comparison is with a '78 Mercury 80hp. There is a thumb-sized hole on the rear side of the shaft housing...
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    What year Johnson?

    I have a Johnson 5.5 hp, year unknown. Model No. is CD - 13 A, s/n 1385885.<br />I'd like to get a manual but don't know much about this motor. I recently took it out of storage where it apparently sat for ~10 yrs w/o running. It was seized up so I decided to check out the fuel/carb system...
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    Merc 80-hp rough idle

    I have an '78 Mercury 80-hp which runs rough at idle and full speed. I replaced all four spark plugs and added new fuel on top of ~3gal of old from last year - Stabil added and engine fogged before storage. After replacing the plugs last week I realized I had overtightened by ~1/4 turn. Late...
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    jet removal tool whereabouts?

    I recently tried to remove the top fuel bowl vent jet with a screwdriver which didn't work and I'm afraid that I'll ruin the head of the jet and create more headaches if I continue with the screwdriver approach. The service manual I have mentions using either a jet removal tool or screwdriver...
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    '78 Merc 800 carb questions

    I have an old '78 Merc 800 that sometimes stalls out after slowing down from near full throttle. It almost feels like the motor can't get enough gas or air when I open the throttle back up. After ~1-2 minutes the motor kicks in and revs up like it should. I've changed gas tanks and now run...
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