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I use to ride a 1976 Bonn in Britain (in the 70's so you know how old I am)
Actually, your screen name gave it away. lol!! 
Is it just the the bike cranks over slowly when cold? The question of "what oil are you running?" comes to mind. If you are running say 20-50, switching to 10-50 might help.
Live to love, love to live.
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