Top speed with 18hp Evinrude on 14′ aluminum

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This topic contains 105 replies, has 22 voices, and was last updated by Avatar stephenspann27 2 years, 6 months ago.

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    stephenspann27

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    #53248

    The carb butterfly is opening all the way and the timing advance goes to the max. I don’t think my motors has any kind of shift lock stuff? I can start it in gear, and I can go wide open in neutral. I’ll double check.

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    stephenspann27

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    #53251

    I bet this piece is supposed to be taller isn’t it?

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    stephenspann27

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    #53252

    Here are the positions at WOT

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    david-bartlett

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    #53254
    quote stephenspann27:

    I bet this piece is supposed to be taller isn’t it?

    Yes it is, that one has been cut off. Nothing to stop you from going to WOT regardless of whether it is in gear or not.

    You don’t have a reed problem? Stuck really bad on one side?

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    stephenspann27

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    #53255

    maybe I do, I haven’t had the manifold off on this motor yet.

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    stephenspann27

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    #53257

    I"m going to cave in today and yank the powerhead and start pulling it apart until I find something wrong.

    Mumbles
    Mumbles
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    #53267

    Hold on a moment before you do anything drastic. The last step on the brass plate might make contact with the block at WOT, not the shift lock lever. I’m sure some models do. There’s a few 18’s in the garage so I’ll take a look when I go out there.

    Do you know if any mag parts have been swapped around in the past? There’s a reason that shift lock lever has been shortened and the motor not making full RPM could be it.

    Mumbles
    Mumbles
    Canada Member - 2 Years
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    #53268

    On this ’65 FD with a ’72 Evinrude powerhead/mag on it, at max throttle the brass plate does make contact with the lock lever but on this ’63 Gale built 15, the contact is made on the starboard bracket, leaving a slight air gap between the plate and the lever. Hmmmm…..

    I have more 18’s but they aren’t handy at the moment.


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    Mumbles
    Mumbles
    Canada Member - 2 Years
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    #53269

    Going thru this thread again, I think you have already shown us the problem.

    The pistons and rings in your white Ebay motor are scored. The motor will never be able to develop its designed horsepower in that condition. Pistons, rings and cylinder walls should be smooth with no grooves or scoring for the rings to seal correctly. Bottom line, the motor is tired and needs attention.


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    stephenspann27

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    #53275

    The above is correct, I just thought since it had good compression and passed the leak down test it was worth trying some other things. I tore the powerhead all the way down this morning. Not a single gasket was leaking, the burn looked even between the cylinders according to the piston tops and the carbon on the head. No smoking guns as far as getting fuel/air in and out of the motor. The verdict is a like mentioned above, the pistons and rings are scored. The rings are still free on the pistons, and bores are not terrible. The motor has definitely been hot. The crank bearing surfaces are blue from running hot. The crank bearing surface at the top (where the seal was leaking) is trashed. The crank out took out of my original, blue powrehead is actually in better shape than this one. Pictures in the next post.

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    stephenspann27

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    #53276





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    stephenspann27

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    #53277

    Crank from teh white powerhead on the right

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    stephenspann27

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    #53278



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    david-bartlett

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    #53313

    Stephen,

    That one is surely worn out. It is like Bill W said, they will continue to run way beyond when they should quit. Time for a new powerhead on your otherwise good motor.

    In your next to last picture, the reed plate looks like one of the reeds was not lined up properly to seal. Maybe this happened when you took it apart. NOt really an issue now, but was just curious if this had anything to do with your dry spark plug issue.

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    stephenspann27

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    #53319
    quote david bartlett:

    Stephen,

    That one is surely worn out. It is like Bill W said, they will continue to run way beyond when they should quit. Time for a new powerhead on your otherwise good motor.

    In your next to last picture, the reed plate looks like one of the reeds was not lined up properly to seal. Maybe this happened when you took it apart. NOt really an issue now, but was just curious if this had anything to do with your dry spark plug issue.

    On the reeds, yea that was my fault, I had taken them apart then just slapped them together. The motor was really in great shape as far as gaskets, torque specs, and corrosion.

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