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  1. DaDaDaDon

    No Power When Cold - 1985 50HP

    (4) New CDI coils arrived today, and installed. Air temp 34, water temp 35 so these are the conditions that made the motor run very poorly. After installing the new coils, checked for spark and was able to get the spark to jump a 7/16" gap on all four cylinders. Went to the boat ramp and the...
  2. DaDaDaDon

    No Power When Cold - 1985 50HP

    I'll get four new coils on order and see what happens. Definitely less expensive than changing the stator. Hopefully the boat landing isn't iced over yet since running on muffs won't demonstrate my concern. Thanks again for all the help and advice.
  3. DaDaDaDon

    No Power When Cold - 1985 50HP

    Thank you for the in depth explanation of the purpose of the ferrite. I have read it three of four times and probably will read it a bunch more until I can fully digest it. (Electronics are not my strong area. Machinist by trade) I don't think the coils are my issue, but they are suspect and...
  4. DaDaDaDon

    No Power When Cold - 1985 50HP

    Ran a compression test and found 125 psi on all four cylinders. Forgot how much a pain the lower cylinder is to get to on this motor with the cowl in the way. I also removed the coils and did some resistance testing on my work bench. I could not get a good read on the primary, spec is .2 to...
  5. DaDaDaDon

    No Power When Cold - 1985 50HP

    When I got the motor I had to reseal the lower unit and install a new impeller. Tell tail has been strong through the boating season but I did plan to change it before winter along with changing out the lower unit lube. When I changed the plugs earlier this week I found all four were kinda wet...
  6. DaDaDaDon

    No Power When Cold - 1985 50HP

    Thanks for the input. I think I’ll start with a spark test and see if I can find a cylinder or two not firing. This motor has CDI ignition which I personally have not dealt with. Probably start on one end (spark plug) and just work my way back to the other end (stator) and see what I find. It...
  7. DaDaDaDon

    No Power When Cold - 1985 50HP

    I have a new to me 1985 50HP Mercury 4 Cylinder, serial # 6589020, that recently has developed a lack of power situation when cold. Hoping for some help in starting the trouble shooting process. I purchased the boat motor and trailer last spring and only changed the spark plugs in the...
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