Originally Posted by metallo
My bike started doing the same thing. Then the resovoir started boiling over now. I dont think its the head gasket cause the oil is not milky. May the clutch switch be causing this?
Assuming you mean the coolant reservoir by your left knee then the clutch switch is really unlikely to be causing that.
You only get mayo when oil and water mix - you could have a blown head gasket pressurizing the water system without any mayo showing.
When the coolant "boils" is the engine temp showing really hot on the dash and is the rad fan running?