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What year is the bike? The old single phase system on the older bikes is marginal at best. Anything over 12v is charging but I would expect 13-14v but not much more and it will be overcharging which will kill the battery just as bad as undercharging.
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 Roast Beef Monster!
Termignoni and Bucci - Italian for pipe and slippers! 
S4 Fogarty, S4R 07T, 748, Series 1 Mirage
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