Bike sat for 6 years and runs strong. Oil looks fine but the res has this colour inside. I'm really hoping it isn't head gasket issue. Only 11k on the bike ! 2012 675
I can't see anything either but if you think you see oil in the coolant reservoir I would flush and change the coolant, and the oil, and see what happens.
I think she needs a coolant flush. The coolant is like a faded yellow kind of greyed out. No other issues to make me think it's a head gasket. I'll have to flush it and update the forum just in case this happens to anyone else
Drain your oil too. If its "milky" brown/tan that means your coolant and oil mixed. Must likely failure point on a 2012 is the heat exchanger. Not particularly common on street bikes but is a "not if, but when" item on a track/race bike.
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