78evinrude
Recruit
- Joined
- Aug 21, 2017
- Messages
- 3
I just bought a 1978 25 hp Johnson that has a problem I hope someone could kindly identify for me. At idle the motor runs fine. Half speed it misses every 30 seconds, at fast speed it misses every 15 seconds. Even with the lower unit locked in, it hits the transom hard, and has sheared the Woodruff key between the flywheel and shaft. It runs fine otherwise, I put new spark plugs in and cleaned the contacts on the coils. I'm thinking it must be the coils, cdi box, or propeller hub. I can't see how it is the timing because it runs fine otherwise, I can't find out how to time it either. It is unlikely the propeller hub because it seems that once that fails it wouldn't recover. Thanks for any help, since it is an old motor I'm thinking someone has had the exact problem. Here is a link to a video of the problem http://courtneychapinceramics.com/cc.../evinrude.html