Re: 1951 Johnson HD-26- calling all Johnson experts!

[r-c]

I think the difference in model number, is because in 1951 the entire line of OMC’s used the "universal" magneto. The previous HD’s had an internal rotor magnet, with the coil heal facing the rotor. The universal mag had the coil heal facing out to a magnet in the flywheel, what we are use to for all two cylinder OMC’s until CD ignition. The one cylinder 1 1/2 and 2 hp of the 70’s and 80’s also used these parts. Rarity? Probably no, easy to fix yes. The TD and TN has the same model number change because of the mag change. If I remember right the T models had a ratch on the mag advance, one way to tell the difference. I haven’t had to do this; but it measures correct to use a modern OMC coil on the heals of an internal rotor type mag. Whether the coil needs to be faced in or out maybe trial and error or no difference at all. I’m sure somebody has tried this.