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  1. K

    1969 Evinrude 25hp 25903D points issue

    I need some ideas guys! If it was an easy one I wouldn't have needed help Thanks Mike
  2. K

    1969 Evinrude 25hp 25903D points issue

    the throttle is set to just move at the second mark(looking at it straight on it would be the mark on the left Mike
  3. K

    1969 Evinrude 25hp 25903D points issue

    I forgot to add I've taken off the magneto plate and inspected all the wires and tested the. Mike
  4. K

    1969 Evinrude 25hp 25903D points issue

    Compression is 120psi on both cylinders new fuel pump, fuel pressure is higher than spec. at 3-3.25 after long idle plugs currently champion J8c (one step hotter) Reeds inspected (good) new gaskets No sign of top seal leaking. haven't removed powerhead to check lower seal Carburetor has been...
  5. K

    15 Hp Johnson won't plane 12 foot boat.

    Don't be too sure that the idle jet ( slow speed needle) only affects Idle I have a great running 1979 15hp #15904E that requires you to open the idle jet about 1/4-1/2 turn from best trolling setting to best high speed Mike
  6. K

    1976 25hp Johnson ignition question

    Also make sure the wire from the driver coil to the bottom set of points isn't grounding on the points it's hard to see from the picture. Note I have replaced 2 driver coins on my 18hp that has the same setup in 2 years
  7. K

    1969 Evinrude 25hp 25903D points issue

    Hi While trying to fix an issue with the motor just stalling at idle I've ran across something I need help with. I purchased a sierra tuneup kit 18-5002 after installation of just the top set and checking with a timing light the timing is aprox. 3/4" out of the two marks to the left of the...
  8. K

    Help with 1973 18hp Evinrude model 18304 A

    Seems to be running like it should after replacing the charge coil under the flywheel even though the new coil tested the same as the old it now has spark on both cylinders Thanks to all who replied Mike
  9. K

    Help with 1973 18hp Evinrude model 18304 A

    No I didn't know that. Only reason I ask that is I'm also finishing up a 1969 25hp that started out as an electric start long shaft motor that didn't have spark on one cylinder, The previous owner had ran a jumper from the solenoid to ground to get the solenoid to work. If I removed the jumper...
  10. K

    Help with 1973 18hp Evinrude model 18304 A

    I read that,but does that also change the that spark on that cylinder from negative ground to positive ground? Thanks Mike
  11. K

    Help with 1973 18hp Evinrude model 18304 A

    I don't have a scientific way other than the screw driver test but they both ( actually 4) feel the same strength. The new driver coil and condensers came yesterday while I was away fishing and it also tested at 1.0 Ohm so I didn't have much faith that it would cure the problem as spec is .85...
  12. K

    Help with 1973 18hp Evinrude model 18304 A

    History is I bought the motor in 2020 as a non running pull start only average condition for the age complete motor. Compression was 120psi on each cylinder with no spark on the top cylinder I ended up going completely through it replacing anything that even hinted at being questionable. I...
  13. K

    Help with 1973 18hp Evinrude model 18304 A

    LOL I realize that, if it were an easy one I wouldn't be looking for ideas. I've learned a few hard lessons along the way one of witch is don't mount the ground lead on a CDI box to the same bolt that mounts the CDI box to the engine (the black washers under the CDI box are actually Plastic and...
  14. K

    Help with 1973 18hp Evinrude model 18304 A

    Yes I know that the driver coil is the one under the flywheel. The no spark issue follows the wires coming from under the flywheel I have swapped the condenser again and the points I have tested both leads with an ohm meter and they both are almost the same. that leaves the driver coil I just...
  15. K

    Help with 1973 18hp Evinrude model 18304 A

    So far I've done 15 of the older Evinrudes 1954 up and this was one of the first ones I did, also one of the newest with the difference being the driver coil powering the two separate coils. I do have all the parts on hand to convert it back to the 2 coils under the flywheel
  16. K

    Help with 1973 18hp Evinrude model 18304 A

    So this is the second driver coil that has lost the top cylinder in 2 years. I've taken the plate off and inspected everything wires are all good with no signs of being pinched. I'm thinking of running new wires just to be sure. Also last year I did loose the top cylinder but found the...
  17. K

    Help with 1973 18hp Evinrude model 18304 A

    I was wrong about it having spark I tested it in the shop and it did, then moved it outside to the test tank to check timing. I have no spark on the top cylinder after swapping the coils still nothing on the top. I had a spare driver coil that I thought was good and tried that but still nothing...
  18. K

    Help with 1973 18hp Evinrude model 18304 A

    I've ran into something I haven't seen before where a timing light will work on one cylinder but not the other when it does in fact have spark. Ignition system has a single charge coil with two sets of points and condensers feeding two separate coils. I have cleaned and checked all the grounds...
  19. K

    Source or part number for the 7/8"-.875" freeze/core plug used on 18hp blocks

    That I didn't know! I assumed since there was a hole drilled at a right angle at the bottom it was a core or freeze plug and being I just picked it up and haven't had it in the water yet and won't till the weather starts warming up. Once again Thanks Mike
  20. K

    Source or part number for the 7/8"-.875" freeze/core plug used on 18hp blocks

    Hi I'm unable to find the part number or a source for the freeze/core plug that measures 7/8" or .875" for the 60's-70's 18hp Evinrudes the one that usually has the model and serial number stamped on it. I found them in steel but I'm afraid it might crack the thin wall of the hole before it...
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