De-coding speedometers

Information on the identification and numbering of frame, motor belly, transmission and other parts
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panz4ever
Posts: 513
Joined: Fri Aug 12, 2005 5:45 pm

De-coding speedometers

#1

Post by panz4ever » Fri Feb 27, 2009 5:09 pm

OEM speedos are stamped with a bunch of numbers and letters on the back of them. Can anyone supply info on what they mean? How they might be applied to identify maybe the year or month made? There have been a couple of questions and answers already regarding speedo faces identifying general years of use and I have a couple of sites bookmarked that help to that end. But I can find no discussion to decipher the stamping that appears on the back. If so, it would be a good one to add to the knowledge base.



LittleAl
Posts: 263
Joined: Fri Jan 02, 2009 8:52 pm
Bikes: 1954 FL Panhead
1976 Sporty
1983 FXRT Shovelhead
2000 FLHT TC
2008 Anniversary Ultra
Location: New York City

Re: De-coding speedometers

#2

Post by LittleAl » Fri Feb 27, 2009 6:36 pm

Damn curious about it myself. I'm even more interested in the differences between the different speedos (0-120, 10-100, 0-100, etc) Police, Military, etc versions.

I have an unknown year Police Special speedo (0-100) that I rebuilt from another regular speedo (0-120) of unknown year and I'm wondering how it's gonna work out on the bike as far as accuracy. It's only more complicated by the different transmission drives available.

Perry Ruiter
Posts: 100
Joined: Mon Jan 26, 2009 9:29 am
Location: Canada

Re: De-coding speedometers

#3

Post by Perry Ruiter » Fri Feb 27, 2009 8:04 pm

Here's an article I did on that ... Perry
http://www.ruiter.ca/mc/info/SWSpeedoDating.html

panz4ever
Posts: 513
Joined: Fri Aug 12, 2005 5:45 pm

Re: De-coding speedometers

#4

Post by panz4ever » Sat Feb 28, 2009 3:19 am

Perry...you tha' mand. Gonna have an extra shot of Jack tonight and tomorrow I am going to go out and see if I can figure it out. Thanks!

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