Johnson AD-12 mystery

[labrador-guy]

63ls, make sure the coils are hooked up to the proper set of points. If you have them backwards you will get no spark! Don’t ask how I know this!

dale

[aquasonic]

When the flywheel nut is torqued properly, is there still any vertical play in the flywheel itself? I had a flywheel with a damaged keyway that would not seat properly. The only way to tighten it up was to put a washer under the flywheel nut, but that was no solution to the problem. The flywheel was dragging on the tops of both coils, but the motor still ran that way. The solution was a good used flywheel and a NOS flywheel key.

It seems unusual that your flywheel is dragging on the armature plate without hitting the tops of the coils first. For some reason either the flywheel, or armature plate, or both is/are way out of square to the crankshaft. If you spin the flywheel and look from the side, can you see that the flywheel does not hold in a consistent plane, or does it "visually wobble" vertically indicating that it is out of square to the crankshaft?

Improvise-Adapt-Overcome

[63lstrition]

We have a new flywheel key on the list to order. That was my best guess as to what the issue is. I will mess around with checking the flywheel and plate orientation this weekend and see how they match. Should be able to rotate easily without the key in it

[63lstrition]

Took some time today to take a look at the AD-12. Attached a few pics below:

The screwdriver is pointing to the impact point on the plate. You can tell that I filed it a little to try to fix the clearance issue. It is hitting exactly the same without a key in it. My guess is that the key will hold it up just enough to allow clearance.

The armature plate itself does not visually appear warped

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[63lstrition]

Here are some more

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[chris-p]

Well that is very odd. I would think your flywheel is no good. Been overtorqued and stretched.

Ill assume you know that your TOP cylinder coil is NFG. I would also order new condensors. Those are originals. The red paper top ones will eventually fail, if they are even good right now.

But first things first, deal with that flywheel. Anyone in his area with a flywheel he can borrow to check it out?

[chris-p]

Take that brass ring off with 4 slotted screws. Is the ring below it flat side up or tapered side up? Should be flat side up. That MAY be allowing it to wobble.

[david-bartlett]

Very odd. Any chance on seeing pics of the flywheel ?

The keys only function is to keep the flywheel and crankshaft indexed to each other. It should NOT hold up the flywheel at all. Fit should be the same with or without the key.

[frankr]

img2405 appears to show that it is right side up. That sort of narrows it down to a bent armature plate or spread flywheel hub or bent flywheel. "Looks to be OK’ doesn’t cut it. I don’t know of anybody that could tell by just looking.

[63lstrition]

One flywheel pic till I go back in the garage. I will do that in a minute or so. The leading edge centered on the picture is the impact point

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