Understand the Motor & Frame serial numbers

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May 8, 2010
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Looking to understand the different numbers on my Frame Head Stock, Left Side of my Motor and on the Forward portion of the Swing Arm.
 
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May 8, 2010
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-Front Frame Head Stock plate:
JUL 71
144283

-Left Side of Motor
20M3S / 140461

-Forward Portion of Swing Arm
134708 N
 

Derek Wilson

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Jun 25, 2004
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-Front Frame Head Stock plate:
JUL 71
144283

-Left Side of Motor
20M3S / 140461

-Forward Portion of Swing Arm
134708 N
By forward portion of the swing arm, do you mean the top of the transmission?

If so - ideally - all of these numbers should match.

From what you describe, you have a 'bitsa' - a bike that has been pieced together out of parts, or has had both catastrophic engine and transmission issues, necessitating the full replacement of each.

The engine is a late 1970, and the transmission is a 1969.

Hope this helps.
 
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May 8, 2010
Messages
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By forward portion of the swing arm, do you mean the top of the transmission?

If so - ideally - all of these numbers should match.

From what you describe, you have a 'bitsa' - a bike that has been pieced together out of parts, or has had both catastrophic engine and transmission issues, necessitating the full replacement of each.

The engine is a late 1970, and the transmission is a 1969.

Hope this helps.
And my Frame is a 1971 ?

Appreciate the above information
 

Ron L

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Feb 27, 2004
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And my Frame is a 1971 ?

Appreciate the above information
If the frame tag is the correct one for your frame, yes. The 1971 and later frame will have the centerstand mounted to the engine cradle, while the pre-'71 has the crossmember further rearward with the centerstand lugs mounted to it.

Does the title match the number on the frame?
 
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