7325johnsonhelp[
Seaman Apprentice
- Joined
- Sep 26, 2022
- Messages
- 31
Me again. Same motor, new issue. After the water circulation issue was solved, I took the motor to the lake. It ran fine for approximately an hour, mostly full throttle, sat off for a couple of hours, and then started fine for the return trip. About 10 minutes in, full throttle, it started "missing". Within a few minutes it was "missing" so bad the boat came off plane. The motor would continue to run until I got back, about 20 minutes, but it was very weak, regardless of throttle position. Lots of smoke, I believe oil. It would occasionally seem to catch" but never for long enough to get back on plane before returning to "missing". It continued to idle rough at the landing and even restarted easily when loading on the trailer, but still running rough.
When I got home, I noticed lots of gray sludge around the prop and general foot area. The motor is up using a transom saver for transport. I first suspected some foot issue as well but now believe that was just unburnt oil/water drainage from the vent holes and exhaust. The foot lube is still fine and water free and no leaks detected after several days.
I removed the plugs. new Champion UJ4J gapped at .030. They were both wet and black. Compression is good and unchanged at 138/140 psi both cylinders. I turned the motor over with the plugs out to see if they were sparking. They sparked only very intermittently, not on every rotation, not even close.
Now when I serviced this motor, I replaced both ignition coils, points, plugs, and condensers among many other things. I did not replace the driver coil. Points were gapped @ .022 as instructed by the service manual, since they were new. Gas is Ethanol free mixed 50/1 with OMC oil.
Seems to me that since both plugs are not firing as I think they should my next stop is the driver coil. I need to recheck the point gap anyway. Suggestions?
Any help is appreciated. Racerone your experience with these motors is invaluable and your thoughts would be greatly appreciated. Just let me know if you want me to check something or post images.
When I got home, I noticed lots of gray sludge around the prop and general foot area. The motor is up using a transom saver for transport. I first suspected some foot issue as well but now believe that was just unburnt oil/water drainage from the vent holes and exhaust. The foot lube is still fine and water free and no leaks detected after several days.
I removed the plugs. new Champion UJ4J gapped at .030. They were both wet and black. Compression is good and unchanged at 138/140 psi both cylinders. I turned the motor over with the plugs out to see if they were sparking. They sparked only very intermittently, not on every rotation, not even close.
Now when I serviced this motor, I replaced both ignition coils, points, plugs, and condensers among many other things. I did not replace the driver coil. Points were gapped @ .022 as instructed by the service manual, since they were new. Gas is Ethanol free mixed 50/1 with OMC oil.
Seems to me that since both plugs are not firing as I think they should my next stop is the driver coil. I need to recheck the point gap anyway. Suggestions?
Any help is appreciated. Racerone your experience with these motors is invaluable and your thoughts would be greatly appreciated. Just let me know if you want me to check something or post images.