I have a volt gauge fitted with a push button so I can check voltage at any time. My new battery will start the bike fine with 12.5v. That?s the lowest it?s been so far. Bike charges to 13.5v while riding and battery drops to 13v when sitting a while.
My previous battery started the bike fine at and over 14v and under that was a sluggish cranking at best.
I also had a problem with the start button not being reliable so I have replaced the switch block with a generic one and use the horn button as as the starter
Hope this helps
Wuz
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