Home › Forum › Ask A Member › Odd grey discharge from lower part of 1962 Johnson 10hp Seahorse › Re: Odd grey discharge from lower part of 1962 Johnson 10hp Seahorse
The motor appears to be running rich. Before just trying to tune it leaner with the low speed needle I would check the thermostat to see that it is operating properly. At proper temp this motor should reach approximately 135 degrees at idle. The closer to this you can get the leaner you can run the engine and the less emissions left to go in the water. You might want to look at reference #26 on ME #308506 oil return hose to be sure it is not kinked or clogged. This keeps the heavy ends of unburnt fuel moving until the next time you run wide open and burn it up. There is a hard line from top main to bottom that needs to be open also.
You might also check your sync & lync to see where your carb is picking up the mag plate. I set my needles where they are straight up & down. When starting a cold engine I back the low speed out a 1/4 turn until the motor warms up. Then put it back into its original position. If at anytime it won’t idle properly there then I know something is amiss. I usually start with temperature on a thermostat controlled engine.
Synthetic lubes or biodegradeble oil will help & I think this engine can run on less than 24/1. It has bearings on wrist pins, but maybe not center main? Someone will be along to confirm. Hope that helps!
Dan in TN