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Topic: 1940 Johnson KA-10 9.8 hp
Started on the subject motor today.
I bought this one several years ago at an annual flea market.
At some point I had the carb off and robbed the long float pin
and gas line for another project…… a Johnson K-80 perhaps.
I since purchased a NOS float pin.
The motor is missing the spark plug cover, but I think it’s complete
otherwise.
The gas tank is in fair shape, with a decent “antique” looking decal,
so this motor will get a good cleaning, and no paint….. I hope!It had been sitting in “cold” storage, and I could barely turn
the engine over. Last evening I gave it a squirt a pee oil in each
cylinder, and let it sit all day in the heated part of the garage.
Happy to say, it turns over nice now, and the compression was
even, but mostly likely “falsely” high, due to the pee oil in the
cylinders yesterday…… 95 psi on each cylinder.
I’m guessing the grease in the gear case was the “stiff” issue yesterday.
The flywheel rope pulley holes turned out to be 14-24 threads.
Somewhere, I have some I made up for the puller.
I found three different length bolts that worked, but
I have a feeling they were metric threads, as the bolts heads
required metric wrenches. Perhaps it would be easier to buy some
metric bolts all the same size, but I need to research this more first!
I did a quick check of the coils with the ohm meter, and one
coil’s secondary is reading around “zero” ohms, but not “open”. Strange?
The other coil was between 4-5 k ohms. I cleaned the probe areas,
but got the same results.
Prepare to be boarded!
Guessing the nut is a 7/16″ x 20 tpi, and the three machine screws
the oddball 12-24 or 14-24, which are a little hard to find.
Do some searches on site for those oddball thread sizes to see
which one for sure. Guessing you already tried 1/4″ x 20?Prepare to be boarded!
Squier, by the looks of all the caked on dirt, I assumed the K-50
used a lot of oil. 😆
I may get my little electric power washer out tomorrow and see
if I can blow some of the grime off.I finished up the magneto today. Not sure why one plug wire
points forward, and the other aft, but that’s the only way the
wire caps screw on. Hopefully I’ll understand when I put it all
back together!
It had rubber boots on the old plug wires. I presume it originally
had the "fork" type terminal ends??Started cleaning up the flywheel, etc.
Made some 14-24 puller bolts today for the old Johnsons. I hate
using an irreplaceable rope plate for a puller, so I got the grade 8
bolts, cuts the heads off, and threaded them for the flywheel.
Hopefully I put them away where I find them for the next job!
Attachments:
Prepare to be boarded!
