My first cry for help!
I've had the 2010 848 now for a couple of months, absolutely loving it. Did the 12,000 km service, including checking belts and valve clearances, all went well there and I've been riding it for a good few weeks since with no dramas.
I commute about 90 kms each day.
One day last week, the bike just stopped running while I was in neutral at a set of lights (not running hot). It immediately started again, but I remembered that it happened.
On the way home from work yesterday it did it once again, and then started again. Twice started me thinking.
Then, further down the road, it stopped again while I was riding (outer lane of traffic on the highway at peak hour, of course). It wouldn't restart, so I managed to clutch in and pull over.
It still wouldn't restart, and a quick check of the voltage showed low voltage (less than 12). A few more attempts to restart only resulted in the voltage dropping further after each attempt, to the point where the display would drop out altogether and then restart, so definitely not getting enough power.
Trailer home and put the battery on charge overnight, starting diagnostics this morning.
All fuses okay. Tested via multimeter on the battery, voltage doesn't rise at all with the engine running, just drops slowly, so obviously a charging issue.
Ran through the workshop manual for diagnostics. First test is the alternator. FINALLY got the 3-wire connector unplugged - that took me 15 minutes alone. It was covered in gunge, as is common, from what I've read.
First noticed that the plastic around one of the terminals had melted - not a good sign.
I was a bit confused on how to test the output voltage from the alternator, ever after the workshop manual instructions, but this awesome post from Richard (Punch):
...had me on track.
So I tested the voltages at idle. I know you're supposed to test them at 2K and 6K rpm, but as I had the meter connected and increased the rpms, the values all seemed to rise proportionally, so I figured the relative values at idle would at least give me some indication as to whether or not there was a charging problem.
With looking at the socket (altenator end), I called the pin going in one direction by itself horizontal, and called it pin 1, and the two other pins in parallel going perpendicular to it vertical, and pins 2 and 3 (left to right).
The melted plastic was around pin 3.
The voltages tested at idle were:
2-3: fluctuating between 6 and 7
To me this indicates the stator is probably junk.
Any advice appreciated.