Fairbanks Morse front mount magnetos

Racing K Models

Fairbanks Morse front mount magnetos

Postby jOe » Fri Aug 05, 2016 7:15 pm

What model designation (FM) were the front mount Fairbanks Morse magnetos that were used on the KRs/XRs?

I stumbled onto FM magneto listings on EBay and saw a bunch of magnetos for Cat,Deere,Allis,Wisconsin, etc and saw one twin cylinder one (X1-2B7) that LOOKED like the body and mounting flange could work-maybe.

Just wondering.
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Re: Fairbanks Morse front mount magnetos

Postby 55panman » Fri Aug 05, 2016 8:30 pm

You may find a body to work but remember that the cam on the rotor is specific to Harley Davidson's 45 degree firing order so you need to get that rotor. You can buy rare earth rotor for HD from Fairbanks Morse yet.
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Re: Fairbanks Morse front mount magnetos

Postby jOe » Fri Aug 05, 2016 10:01 pm

I know. I wasn't planning on doing it, just wondering if HD got the body off the shelf from FM.
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Re: Fairbanks Morse front mount magnetos

Postby thefrenchowl » Sat Aug 06, 2016 5:17 am

Joe,

The body is not off the shelf.

The body is cast with a specific front nose with 2 offset and oblong ears to fix to H-D alloy adaptor that itself fixes on the crankcase.

And in case you're wondering why it needs an adaptor between magneto and crankcase, the KR case was designed for a specific Wico magneto which was used 52 till 54, expensive. They then switched to the cheaper/smaller Fairbanks, hence the adaptor...

Image

The rotor shaft, the gear -and the mouse ; O )- are also special

Adaptor plate, my own (metric...) AutoCAD drawing:

Image

Patrick
Last edited by thefrenchowl on Sat Aug 06, 2016 5:34 am, edited 4 times in total.
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Re: Fairbanks Morse front mount magnetos

Postby thefrenchowl » Sat Aug 06, 2016 5:26 am

4 various shots for a better look at the genuine article, nowt to do with tractor ones!!!

Image

Image

Image

Image

Fairbanks Morse ref is XZ2B.xx, H-D ref is 2950356R or RB, both engraved on the Fairbanks Morse ident plate riveted on the body.

Image

Patrick
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Re: Fairbanks Morse front mount magnetos

Postby friday » Wed Oct 12, 2016 12:51 am

This K model site is the most detailed for HD magnetos . I did a net search and everything leads to Hunt or Morris minus any oem part numbers .

the serial plate there XZ2B63 , XZ = type , 2 = no of cylinders , B = mounting , 63 = HD mo co , HD p/n 29503-56R

http://www.oldengine.org/members/diesel ... FMType.htm

http://www.harleykrxlrtt.com/parts_3.htm

info surrounding K model is the best historic info on the net

http://www.oldengine.org/members/diesel ... Fund64.htm

^ this page gives an idea how enormous the magneto once was , EVERYTHING had a magneto .
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