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Markon B21B Generator Internals.

I have an old generator which I used to use a lot - It is a Honda GX340 at the driving end and a Markon B21B generator end.

The whole thing blew up pretty horribly last year and I thought it was the engine - I managed to get a new Carb to replace the very broken one and now the engine works fine again but that was when I discovered that the Markon end is also broken (I have no idea how both broke at the same time).

I have dismantled the B21B and the fan assembly had shattered - Superficially this shouldn't matter but there seemed to be some electronics in the fan and I don't have a clue what they are. I have pictures of the framgents, and I have 4 bare wires sticking out of the inner coil.

I suspect this is something I can mend if I knew how - But I am stumped now, I have reached my limit of being able to bodge without some pointers.

The generator end is here:

And there is a manual for a newer and less powerful Markon Generator End here which shows nothing at all at the Coupling Fan end:

So... Any ideas anyone?


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I suspect the wires went to a bridge rectifier module...something like this:

Third item down at this site:

This an epoxy packaged one... they also have metal ones as well.

Posted on Apr 24, 2010

  • the_kfont Aug 27, 2011

    Hello Michael, I realize this post is a little old. I have the exact same markon b21b and am tinkering on it as we speak. Not much online about it, nor schematics. Would you be so kind as to explain the values of the 3 wires coming from the top of the generator head? They are numbered, however, without knowing what the numbers mean, I don't know which is hot, neutral, or ground. I'm needing to "flash field" the unit and this info would be most helpful. Perhaps I can provide the info you're looking for relative to your rectifier/fan concerns. Regards, Kevin alterego_k (at) yah00



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