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  1. M

    2003 75hp 2-stroke ELPTO Rough Idle with Video

    Well I thought I’d make one more post to wrap this up. I ended up putting a 17 pitch aluminum TP prop on, and that eliminated the over rev issue. Wot no longer surges, and RPMs at 5150. Max for this motor according to Merc is 5250. I could probably go up one more pitch, but I’ll run this till...
  2. M

    2003 75hp 2-stroke ELPTO Rough Idle with Video

  3. M

    Uh oh..New Transom?

    Boat is back in one piece finally. Motor was mounted on the jack plate, and now that I’m measuring from the actual AV plate the height looks good. I think I can actually raise it an inch or so to account for the 4.5” of setback. More importantly the transom is rock solid with me bouncing up and...
  4. M

    Uh oh..New Transom?

    Well, another long day but we got the new transom installed. Minimal amount of fuss going back in, and only one hiccup. I had to tap one of the motor bracket bolts through because it was a little snug. On the way through it splintered a small surface piece of the varnished side of the new...
  5. M

    Uh oh..New Transom?

    Here is today's update: Final coats of epoxy were applied. Tomorrow I'll begin sealing with spar varnish. Only a small portion of one side of the transom is exposed to the elements, so I will just varnish that one side. I'll also cut out the transom brace board that goes on the outer aluminum...
  6. M

    Uh oh..New Transom?

    Update a short questions. Classiccat, did you add filler just for the holes? And did you chamfer after drilling the epoxy, or before filling the holes? I have a few unused holes in the back aluminum transom enclosure (bad terminology). I have some fluxless aluminum brazing rods and map torch. I...
  7. M

    Newbie Question on Outboard Sensors And Wiring

    I’ve only ever run small tiller outboards and John boats, so pardon the rookie questions. Now I have a center console and installing a 2003 75hp elpto. I know that the tach sensor is already run in the 9-pin plug up to the throttle controls. What I’m not sure about is what other sensors, if any...
  8. M

    2003 75hp 2-stroke ELPTO Rough Idle with Video

    I’ve gone through quite a few threads/videos. Trying to avoid chucking parts at it at random, and looking for a place to start. Here is what I know so far. Motor is new to me fuel tanks, lines, bulb, and gas are all new and worked with previous motor compression check with engine at temp...
  9. M

    Uh oh..New Transom?

  10. M

    Uh oh..New Transom?

  11. M

    Uh oh..New Transom?

  12. M

    Uh oh..New Transom?

    Installed a 75hp 2-stroke in the transom today with a 4” Jack plate. Transom flexes when I (170lbs) stand on the ventilation plate and bounce a little. Video attached. Is it time to rip it out and replace? The flex is along the line of rivets holding the lower transom brace. Also found a crack...
  13. M

    Motor Change on my 1973 Mariner 18'

    Looks like my pictures didn't attach on my previous post. I'll have some on this on. Big day today. I pulled the old motor and inspected the transom. I'm not the expert on this, but I stabbed around with a thin flat-head screwdriver and didn't hit any soft spots or notice any rotten wood. The...
  14. M

    1974 Mariner Possible Leak Points

    A couple of questions on water in the bilge and how much, if any, is considered acceptable/normal on these riveted boats. I have an automatic bilge pump installed on the hot batt bus. After a full 8-9 hours on the water the other day i was pulling the boat up the ramp on the trailer and the auto...
  15. M

    Motor Change on my 1973 Mariner 18'

    Well, I took a chance on a 2003 75hp Merc 2-stroke. One popped up down the road from me for a good price and came with controls. I will more than likely be taking it to the local boat mech for the engine swap, rigging, and electrical. At 300lbs I’m not set up for a diy swap. I’ll need the wiring...
  16. M

    Motor Change on my 1973 Mariner 18'

    Upgrading from my 1985 50hp merc. I've read the boat is rated up to 125. I found a 2001 Merc 2-stroke 125hp in good shape for $5k. It's a little more than I want to spend, but it will also plug and play with my existing controls. I know 4-strokes are heavy, but have 2-stroke engine weights...
  17. M

    73 Starcraft Mariner 18' - Help with fuel tank change and battery relocation

    Put in a full day of work on the boat today. Here is what I have so far. I ran short on conduit so still have a few short runs to tidy up. Added 10' louvered vents to back wall panel. Ordering hose/clamshell vents to increase ventilation from low area around bilge pump. Replaced some bad wood in...
  18. M

    73 Starcraft Mariner 18' - Help with fuel tank change and battery relocation

    Thank's to you both. The console has room for the batts, but there is a fairly large live well installed there as well, which doesn't leave room for a tank. I'm leaning toward just two portable 6 gallon tanks with a fuel selector valve, and maybe going 90hp instead of 115. Do you think if I...
  19. M

    73 Starcraft Mariner 18' - Help with fuel tank change and battery relocation

    Hello all! New to the forum and this is my first post. Hope it's not too much of a doozy! I'm landlocked and only boat on small-ish lakes. Mostly just fishing, with some cruising here and there. Picked up a new-to-me '73 Mariner 18' center console with a 1985 50hp merc. Previous owned had put...
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