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    Mariner 3.5 hp Lower Unit Removal

    I've got a little Mariner 3.5 here, I think from the early to mid 80's. The tag has 642 S 032734 on it. Anyway, I just started it and it wasn't pumping water so I'm in the process of dropping the lower unit to replace the impeller. So far I've removed the 14mm nut and the 14mm bolt, and the...
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    1968 Merc 6hp Water Pumpimg Issues

    This one's really got me scratchin' my head. I picked up a super clean old 6hp for cheap because it didn't pump water. I dropped the lower unit and took the pump apart. Everything looked great, and it actually looked like a recent impeller replacement. I chucked the driveshaft in a drill and ran...
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    Evinrude 9.9 Year? No Spark Troubleshoot

    I recently picked up a super clean 9.9 Evinrude. Kinda neat that it's an electric start 9.9. It's been in storage for a couple of years, and the guy I got it from said it was running when stored but now it has no spark. What is a good place to start in troubleshooting the no spark issue, and is...
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    1984 Evinrude 30HP Engine Knock

    I have a friend who has a 1984 Evinrude 30hp that runs fine, but has a loud, very noticeable engine knock at high rpm under load. You can't hear it at low rpm. I'm thinking rod bearing. Can it be anything else?
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    Merc 50hp Bigfoot Year?

    I just bought a Merc Bigfoot 50 4 stroke for cheap and I'm trying to determine the year of it. Serial # OG270387. Is there a link to a site to determine it's year of manufacture? This one has the dreaded "water tube grommet overheat" issue, but it has super low hours and I picked it up for a...
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    1961 Johnson 5.5 hp replacement coils don't fit

    I'm working on this old 5.5 for a friend, and along the way I discovered a set of coils that were all age cracked and nonfunctional. When I used the current part number for the coils during an online search, I was provided many options. I had the choice of OEM, Sierra, and CDI. I bought the CDI...
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    1993 Sport Jet 90 Tachometer Question

    I currently have a 93 Sea Rayder with a Sport Jet 90 in it. These boats came without a tach included in the instrument cluster. I would like to install a tach just for peace of mind. Is there anything specific to these engines that I should be aware of when buying a tach? I have located the gray...
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    1961 Johnson Seahorse 5.5 intermittent/weak spark

    I've got an old Johnson 5.5 that I'm trying to wake from the dead. It is in mint condition but has been in storage for about 5 years. It has been converted to single hose gas tank. I've tried to start it in a barrel but it shows a very weak or intermittent spark. It will occasionally run for a...
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    Sport Jet 90 no spark at bottom cylinder

    I'm just about at my wit's end with this thing. I recently bought a 93 SeaRayder with a Sport Jet 90 engine for cheap money (I know, I know,lol). The guy that I bought it from said that it ran great when he parked it at the end of last season. He said that when he launched it this season, that...
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    Sport Jet 90 has no spark at bottom cylinder

    I'm just about at my wit's end with this thing. I recently bought a 93 SeaRayder with a Sport Jet 90 engine for cheap money (I know, I know,lol). The guy that I bought it from said that it ran great when he parked it at the end of last season. He said that when he launched it this season, that...
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