Originally Posted by K2m
I don't think that is corrosion billy. Their has been a gap develop between those contacts and the spark has had to jump between them. This is the result of that. It does look like water damage but it is not. I'm sure someone could explain this, and the process that causes that result.
Very possible indeed.
I should also note, however, that there was a very slight amount of condensation underneath the rubber cap. Not much, but it was there nonetheless.
BTW, I don't wash this bike very often (i.e., maybe 5 times since 2008)...
KTM '08 690 RFR, '08 990Adv S (carbs), '07 640Adv, '03 540EXC, Honda XR650R, Ducati 851, Moto Guzzi 850 Lemans & 2VT and Yamaha RD350.