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  1. M

    2005 Johnson 90hp 4-Stroke J90PL4SO Lower Unit Knock at Idle Forward/Reverse

    Hi everyone, I'm running this engine on a 18' Starcraft Mariner center console, circa 1974. I tried numerous props before settling on a Turning Point 13x23 stainless 4-blade to get me in the right RPM range at WOT. I'm getting a knocking noise in the lower unit around the prop area only at...
  2. M

    Help with motor height adjustment

    1974 Starcraft 18’ center console 2004 Johnson 90hp 4-steoke Vance engineering 4” setback manual jackplate 13x21 4-blade turning point prop My previous motor was a 25” shaft and my transom is for a long shaft. I used the jackplate to get the motor to a more reasonable height. I recently...
  3. 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...
  4. 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...
  5. 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...
  6. 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...
  7. 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...
  8. 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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