08-12-14, 03:20 PM
I took the bike out for a run this morning to warm it up for another oil change and made a few measurements for comparison.
It had been standing two days and the battery read 12.7v.
Ignition on, and the voltage dropped to 12.3, though I later realised that the heated grips were drawing current at this point.
Cranking: the voltage initially got as low as 9.5v though rose to 10.1v once it was turning a bit quicker.
As soon as the engine fired and I let go of the starter button the volts came up to 14.0v.
I turned the lights on and it read 13.8v.
The latter two readings were with a fairly brisk on-choke idle of 1500rpm.
If you've a voltage of 10v once the engine is running it still points to a duff charging circuit so far as I can see. Possibly a duff battery (despite its newness). I really doubt that the starter motor is the cause of the problem, but vehicle electrics are good at making me look an idiot.