Norton Flywheel

S

Stephen Hill

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Oct 28, 2009
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I have a Norton flywheel with a raised casting number 06-0732 on it.
Does anybody know what crankshaft and bike this belongs on?

I am unable to find 06-0732 used as a Norton part number. I appreciate that a casting number is not necessarily used as a part number.

I have a couple of crankshafts with a number 06-0731 on the flywheel, and it appears this is also the part number for 750 Norton twins.

I did find a vague reference that a flywheel with 06-0732 on it might be a 06-0731 part number.

Clear as mud??
 
F

Thread 'crankshaft compatibility'

Hi, could somebody please tell me if all 750 crankshafts are compatible. I have a 1969 assembly stamped 06 0732, which has seen better days. If I can find a crankshaft from an earlier, or later model 750 will I be able to fit it, even if the part #s are different, cheers, David
May be here ...
A

Thread 'Difference among 750 crankshafts'

I note that Norvil lists three different part #'s for 750 crankshafts. One is for Atlas, G15 etc, one is for Atlas plus 750, and 850 and one is for early Commando.
I spoke to Les on the phone inquiring about the difference among these cranks. He told me that the only difference is the balance factor and the orientation of the keyways.
Can anyone verify that this info is correct? I seem to remember that the drive side crankshaft cheek on the Atlas, G15 was different either in overall length or taper length from the Commando.
Also, does anyone know what difference there would be...
 
Thanks marineatlas.
Following your link, I see that Dynodave identifies flywheel (casting 06-0732) as part #06-0731. Which makes my mystery flywheel correct for a 750 Commando.

The built up 750 flywheel I have (so identified by previous owner) has a flywheel stamped as 06-0731.

If there is any rigour to this exercise, it means that a flywheel with cast numbers 06-0732 and a flywheel with stamped numbers 06-0731 are both pn 06-0731. Even though there are observable physical differences between them.
 

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