problem running

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stuart fishleigh
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Joined: Thu Sep 03, 2009 7:56 pm

problem running

Post by stuart fishleigh »

hi folks. my old man has a Norton rotary classic. it starts up fine but when its at running temp it coughs black smoke on tic-over.i have cleaned the carbs, fitted new spark plugs, no change!common sense would say over fueling, blocked idle jets.have also checked diaphragm in fuel tap and vacuum pipe.any ideas?cheers stu.
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Interpol2471
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Joined: Mon Oct 20, 2008 1:02 am

Re: problem running

Post by Interpol2471 »

Have you checked the o rings on the choke enrichening device as these crack allowing extra fuel into the inlet? I think Richard posted some pictures some time ago on the removal, if not it's very easy smiley
Various rubbish in various states of decay.....
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