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Might be you discovered why you put it in the shed in 1971. I can't remember a lot about 1971.


You did verify spark the old fashioned way, right? Plug out laying on head with plug wire attached look for spark when kicking it over.


If the plug on the dead side is bone dry, it's not getting enough fuel yet. My experience is an old cold Norton likes a bunch of fuel to start.


Does the Atlas have a little distributor on it? Cracked distributor cap, poor rotor contact maybe.


I would do everything I could think of before taking the head off. Once the head comes off, you never know what you might want to change once that can of worms is opened.  Modern ignition, premiers,... the list goes on.


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