Question about 1998 Norton C 652 SM International

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My '73 Norton 850 Commando handlebars vibrates at idle.

What is needed to correct this? Where can I get the parts?

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  • Paul W
    Paul W May 11, 2010

    Good Day!
    Your description is very Brief? I am guessing you need some repairs? I have a local Norton & British spares stockist and if you give me more details I'll send all relevant information to you.
    Thanking you in anticipation,
    Paul 'W' U.K.


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Hi pl427
I love these bikes. Vertical twins of this era vibrate, is just how it goes. Engine design was simple back then and no counter shafts are used, so there is a degree of vibration at low revs produced by 2 big bore pistons that will make the handle bars get a real bogey on at idle.  If the carbs are out of sync,or need a tune, then you may have a lazy clyinder at idle that is producing the vibration also. Not sure if your bike has them, but some have rubber bushes that mount the handlebars. These can get sloppy with age and may need to be replaced. Another trick if the vibration is anoying you is to mix some lead shot with silicon and fill the ends of the handle bars up to "weight" them and reduce the vibration.
click here to see one walking on its center stand. Notice the way everything is vibrating on this old girl. 
regards robotek

Posted on Jan 08, 2009

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