So following this thread - https://www.nortonownersclub.org/forum/fitting-alternator-crank-dynamo-cases
I'm searching for an 88 crank with a crank pin bore less than the crank I have which has a 1" bore. Referring to the text from the dominator service notes (see attached pics) Im led to believe that I have one the early weaker cranks and should replace it with a stronger one. Realising that it's unrealistic to ask vendors to strip cranks and measure the pin bore I've asked them to do a depth measurement from the journal face to the opposite inside face of the pin so that I can compare it to mine. Mine measures 31.5mm.
Norvil have a reconditioned crank that measures the same and Eldon at Owens has been through about 20 500 cranks (dynamo and alternator) and says they're all the same.
Can anyone confirm that the three bore sizes mentioned in the service notes existed??? Norvil seemed to think there were only two and only the SS had the thicker pins.
im rebuilding this bike to ride it so don't want to ride in fear of it blowing up every time I wind it up.
Please advise.
cheers,
pete
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