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  1. M

    Replacing rotten floor in a 1979 19' Marktwain

    The old floor was taken out and now I am left to put the new one in. Any suggestions, kits, or sites that I can find more information on doing that?
  2. M

    1979 Mark Twain I/O manuals (165 hp 6 cyl.)

    I have manual 4 for this boat but need manual 3 if anyone has it. thanks.
  3. M

    1979 Marktwain inline 6 cyl, 165 hp low flow fuel pump

    I cleaned the fuel pump last year and replaced the fuel filter. Now when I take off the fuel line going into the pump there is no fuel coming out. The fuel shut off switch is not plugged. I thought that there should be if I remember correctly. I have 3/4 tank of gas. I know the manual says...
  4. M

    I am looking for the wiring diagram or my running lights.

    1979 Marktwain. I have the rest of the electrical working fine. I can't figure out which poles to plug the running light wires into as the are missing completely. thanks,
  5. M

    Lower unit water pump on 1979 Marktwain 165hp

    I have been told by a local mechanic ($90 per hour!) that I should replace the water pump in my lower unit every 2 years. Is that something that is necessary?
  6. M

    alternator not charging battery

    I replaced the coil as mentioned in my last thread, took the boat out 2 days ago for an hour and a half with no trouble. Normal boat and float. Took it out again today, rode for about 15 minutes then sat and cleaned while listening to the radio for 20 minutes. Then drove back to the dock to...
  7. M

    1979 Marktwain, 6 cytlinder has a cracked coil

    I found a hairline crack in the neck of the coil. One of the posts was arcing to it, not allowing it to start. I wrapped it in electrical tape and that stopped it. That isn't a permanent fix, especially when it gets hot. Can I repair it or does it have to be replaced? When I look online I find...
  8. M

    1979 19' Marktwain 165 hp I/O trimming

    My Marktwain has 2 up trim buttons. When on plane am I supposed to trim the lower button all the way up for better fuel mileage or should I just leave it all the way down? Will it make any difference if I am pulling a skier to tubber? thanks
  9. M

    1979 Marktwain 165 hp I/O. Dying when hot

    I have had the boat out twice this week and both times after it gets warmed up it dies when shifted into nuetral. Then it will not start without the throttle pushed up nor go into gear either direction without dying. It was winterized and had the lower unit rebuilt last fall. Any ideas?? thanks
  10. M

    1979 Martwain 19' 165 hp motor dies when hot at low rpms

    I have had my boat out twice this season and both times after about 40 minutes of running around and then sitting, it keeps dying at low rpms and wont go into drive without dying. I had the lower unit fixed late last fall and the shifter cable came completely off the other day. It starts and...
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