From:Mike Electronic:michael.schmitt-A-us.army.mil
Subject:RE: RE: 1958 Model165 Electrical system Date:Tue Dec 20 19:25:42 2011
Response to:16688
Jim,
You are partially correct. The ST Models (165cc) all came with a battery/external coil ignition, a generator, and a voltage regulator. The generators had a single armature and 4 brushes which supplied power to both the ignition and the lighting system. The true "Hummer" B Model (125cc) all had magneto ignitions with separate coils to power the ignition and the lights, all internal, very similar to a lawn mower. The Hummer had no battery or voltage regulator.

Your short was probably somewhere in the lighting circuit and caused enough of a voltage drop to dim the lights and reduce the efficiency of the coil ignition and make the bike run bad.
Mike

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I'm responding to my own post here. From looking at pictures of the 1958 Model 165 it appears that it did have a battery and that would explain everything. A short in one of the Armatures would cause both less power to the headlight, when it was on, and to the engine ignition system. I couldn't figure out how to delete my post. Still, tell me if I am wrong.

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I just want to know if I remember a few things correctly. It has been about 50 years since I sold my 1958 165cc.
It had no battery, right?
The engine ignition ran off a magneto, right?
The headlight ran off a generator?
Is the generator simply different armatures (two?) running off the same magnets as those that supply the magneto?

As I recall I had a short in an generator armature that caused my head light to be dim. What doesn't make sense to me is that I vaguely recall that it also caused the engine to run poorly when the headlight was on. But only when the headlight was on. Does that make any sense? It doesn't to me if the two "systems" run on different armatures.