Reply To: Newly acquired Johnson Jw-10 needs Carb Rebuild at least

[David Stanton]

Your JW-10 is a 1953. Good motor! and a smooth runner. If you get the OMC carb kit, it will have a new float in it. If not, you may have to dry out and reseal the old float if the protective coating is flaking off, which ethanol in gasoline attacks. I’ve resealed floats with hot fuel proof clear model airplane “Dope” that is getting hard to find. I’ve heard of people resealing them with superglue, but haven’t tried it. The lower unit gearcase takes marine gear oil – not grease, and you can use any marine gear oil except Type C, which is for electric shift motors.
The carb is an easy one to rebuild, just be sure you get the small, thick “donut” gasket on the part that hangs down to the bottom of the carb bowl, or it will flood when you speed it up. That is part #32 inthe view at the link below – it’s for 1957, but same as your 1953.
3 HP JW carb
Dave