I'll try to be concise but I'm having a variety of problems with this motor.
78 Johnson 140
Starts fine when cold but once warm it tends to fire once and kick the starter out but not catch and run. The problem is not cured by chocking the motor and I just have to keep trying it until it starts. Does not do this all the time and sometimes it will do it once then start and other times it takes 7 or 8 or more tries before it starts.
Motor idles around 2000 on the muffs and 1000 in the water. It's on a pontoon and sits deep in the water. It tends to act like it is loading up at idle in the water and will slowly die at times but not always. I use the fast idle lever to keep it running when this happens.
It will stumble on transition in gear sometimes. I can throttle up to 2000 and when I try to go past that it stalls. If I let it run at 2000 for a bit and play with the throttle it will cure itself and run fine. Runs fine at speed but I do not cruise at over 4500 unless the lake is really smooth but it will run fine all the way up to 5800. Last summer tapping of the choke would cure this and it only happened at 1/2 a tank of fuel or less so I thought fuel starvation. This year I put an electric fuel pump on it to "prime" the factory pump and but it still did it on both trips so far this year. Not always but occasionally and I did not try the choke tap trick this year.
It almost seems as though it's over fueling and causing a miss but the carbs have been cleaned, float level set, and they do seal, hard bulb when pumped up. It does not smoke excessively nor does it put raw fuel in the water.
Last year I had a bunch of ignition issues with a failed stator and two bad coils. I replaced all four coils and wires as a preventative measure and spark is good. Compression is consistent on all cylinders but I can't recall the exact reading as it was taken last year during my troubleshooting of the ignition issues. Above 100 is all I can recall but can do another test if that is warranted.
Plugs are new last year and are the "strapless type" that are correct for the motor according to this site and they look fine with normal coloration and no gap bridging or visible cracks.
Again motor runs fine above 3K actually other than the transition issue it runs fine at 2K. No issues, pulled the grand kids round on the tube for a couple hours during the day. Cruising across the lake is not an issue but slow speed and starting is my biggest trouble.
78 Johnson 140
Starts fine when cold but once warm it tends to fire once and kick the starter out but not catch and run. The problem is not cured by chocking the motor and I just have to keep trying it until it starts. Does not do this all the time and sometimes it will do it once then start and other times it takes 7 or 8 or more tries before it starts.
Motor idles around 2000 on the muffs and 1000 in the water. It's on a pontoon and sits deep in the water. It tends to act like it is loading up at idle in the water and will slowly die at times but not always. I use the fast idle lever to keep it running when this happens.
It will stumble on transition in gear sometimes. I can throttle up to 2000 and when I try to go past that it stalls. If I let it run at 2000 for a bit and play with the throttle it will cure itself and run fine. Runs fine at speed but I do not cruise at over 4500 unless the lake is really smooth but it will run fine all the way up to 5800. Last summer tapping of the choke would cure this and it only happened at 1/2 a tank of fuel or less so I thought fuel starvation. This year I put an electric fuel pump on it to "prime" the factory pump and but it still did it on both trips so far this year. Not always but occasionally and I did not try the choke tap trick this year.
It almost seems as though it's over fueling and causing a miss but the carbs have been cleaned, float level set, and they do seal, hard bulb when pumped up. It does not smoke excessively nor does it put raw fuel in the water.
Last year I had a bunch of ignition issues with a failed stator and two bad coils. I replaced all four coils and wires as a preventative measure and spark is good. Compression is consistent on all cylinders but I can't recall the exact reading as it was taken last year during my troubleshooting of the ignition issues. Above 100 is all I can recall but can do another test if that is warranted.
Plugs are new last year and are the "strapless type" that are correct for the motor according to this site and they look fine with normal coloration and no gap bridging or visible cracks.
Again motor runs fine above 3K actually other than the transition issue it runs fine at 2K. No issues, pulled the grand kids round on the tube for a couple hours during the day. Cruising across the lake is not an issue but slow speed and starting is my biggest trouble.
