Re: 1936 Johnson A-80 4.5 hp power head HELP!

[squierka39]

On my K80 the flanges where bunked up with built up crud, push the crank back so you see the flange and clean it up good, it wouldn’t take much to not fit by the rings. You’ll get it.
I doubt that a groove has worn in, the center isn’t a bearing so the fit is not tight. The ring should grip rotary valve and spin in groove of block.
The K series is pretty close to the A just bigger, so your manual should help you.

I’m sure your noticing a lack of responses from people. I’m not sure why but our motors are not the favorite of collectors. But, they are great running motors.