1968 Johnson 20 HP, FD-22A

[jones6780]

First post for me.

I bought this older motor and it was running fine for several months. Then last week I hit a submerged log and now it has picked up a missfire. It will run fine but every 10 to 15 seconds it will act like one cylinder fires early? I have replaced the flywheel key, it was damaged but not sheared, and replaced the nail that was used for the prop drive pin with no improvement. Any ideas??

Russell

 

[joereeves]

If this misfire takes place at a low rpm, it is usually due to a carburetor set too lean on the slow speed needle valve.

 

[jones6780]

Thanks, I found your other post on carb adjustments. I tried it today and it seems to have fixed my problem. I will put it in the water tomorrow to find out. Thanks again.