Hello,
I located a 1963 Model 50 in Idaho, USA, last November, and am trying to restore it. I have the motor torn down to the assembled crank. I have been studying the Mike Pemberton DVD's on rebuilding Norton singles, and don't believe I have the tools or the experience to tear the crank apart. I measured the radial play (up and down movement) of the rod and it is around 0.006 inches. Are there specs for this? Is this within acceptable limits? I would appreciate any advice/ help going forward. Thanks,
Peter B.
Mike Pemberton
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Big end play....
... usually it's said that if there's any appreciable play then a new big end is required. Six thou is rather more than "appreciable". In theory it should be checked after washing any oil out.
However, make sure you're not confusing angular movement, which is common, with vertical up and down play.
If it does need replacing it is quite involved and needs a number of special tools - not something I'd attempt myself.
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With oil in the assembly you…
With oil in the assembly you should not feel anything more than the faintest trace of movement in a well used assembly thats probably 75% through its life. However I had a prewar Ariel that would Knock loudly if pressed,but with easy use and backed off ignition lever it carried me round on short runs into Kent for several years ,lent it to a "mate" who tried to ride it up a tree, wrecked it.Not really his fault ,as no one could handle it over 50mph.
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Big end play...
thank you Ian, likely need to rebuild the lower end, and hope to find someone to do it
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Crank repair
Try Sonny Angel's Motorcycles in National City (San Diego area).
He did my Model 50 and my brother's ES2 as well.
Mike
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Crank repair
Mike,
Thank you Mike for the repair shop lead. I called Sonny Angel's shop last week and spoke to a fella who was there doing some work. He told me that the shop is being closed down. He gave me another lead and through a series of phone calls, I found out that Sonny is with the angels now, and there is a shop near by that can do the work called Barker Machine shop. Thanks for the help.
Pete
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Mike would be the one to ask - I believe you can contact him through singles technical via this site .
Some years back I rebuilt my ES2 motor before his DVD was available. Mike coached me via e mail as I am in the USA .He was very generous with his time and sharing his knowledge and I am greatful to this day.