My bike is losing coolant. Recently, whenever the bike is hot, there is always some coolant seen flowing out from the vent. My coolant bottom is at the right side, whereas the vent is located at the left side on the engine itself, facing up, feels like a hole, near the gear shifter. There is no cap covering it, so I assume it's a vent for pressure or something. There is no leaks at any pipes above. If got, I would have seen the trail of redish/whitish stain left behind. Currently only seeing redish/whitish marks left behind.
So far, it keeps of losing until the coolant reservoir hits the min. mark. If top up, it will leak until min. mark again.
What could be the problem? It only started recently. My coolant is the Shell coolant. It's red colour.
In the pic the red circle shows roughly the location of the hole. Borrowed pic, so not my engine.