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  1. JohnnyGuy

    76 Johnson 15hp "Lurching"

    As a follow up to this. I did a compression test today and got 110psi in the top cylinder and 105psi in the bottom cylinder. I have one of the lightup spark tester and it indicates spark on both, but I do not have a gap tester, so I suppose that will be the next thing to check. These are the...
  2. JohnnyGuy

    Intermittent Pull Start Issue (pinion not engaging on starter pulley)

    I have a 76 15hp Johnson. As purchased the pull cord is not tight to the lower cowl, it hangs loose approximately 3-4 inches. We were experiencing intermittent issue with the pinion gear not engaging (or running up the splines of) the starter pulley to engage the flywheel. When this happened...
  3. JohnnyGuy

    76 Johnson 15hp "Lurching"

    Finally got my new to me 12ft tinner with 76 15 out this week. It was a little hard to start at first the bulb takes alot of pumping. It was stalling out while trolling every so often. Then we (my brother in law and I) experienced a drop in piwer yesterday morning. I pulled the plugs to have a...
  4. JohnnyGuy

    Should I be using Non-Ethanol Fuel and SeaFoam

    Hey all, My brother restores and work on lots of OLD Lawn Boy's from the 50's, 60's, 70's etc... He has always told me to use non-ethanol premium fuel in my two strokes as the ethanol in the fuel tends to leave a "gummy" residue and has the tendency to build up gunk and clog the carb, etc... I...
  5. JohnnyGuy

    Water Pump Housing to Plate Sealant?

    Hi all, I will be installing a water pump kit on my new-to-me 76 Johnson 15hp this weekend. I've watched lots of videos and have done lots of reading. So far I have come up with the following: Water Pump Housing 3M 847 Water Pump Housing Plate OMC Gasket Sealing Compound (I'll be using...
  6. JohnnyGuy

    76 Johnson 15hp - Water Pumping? Previous Overheat?

    Hey all, First time poster, long time lurker. I FINALLY got myself a boat. Picked up an older 12ft Tinner with a 1976 Johnson 15hp on a trailer for a good deal... I barrel tested it when I picked it up. It started up nicely, shifted into both gears nicely, revved up nicely. I didn't notice any...
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