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Bummer, ok so if the 65 runs ok then try the 67 with the 65 spark plugs to eliminate them or a new set.
My friend said he had the battery tested on his Norton so i fitted a new battery on his bike and the problem was resolved, i would try a new...
A low battery will cause a misfire and retarded ignition with Boyer ignition, had one the other day, fitted a new battery and problem gone.
Looking good for another attempt :-)
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Welcome :-)
Nice Golf, propper car before all the silly electronic driving aids :-)
Keep at it and nothing beats doing it yourself :-)
Old things are always better lol.