That tank is just an expansion tank, not an overflow as on a Yamaha WR, street bike, or a car. It operates at full system pressure. If the cap burps the coolant is still lost on the ground. IMO its just another thing to fail. On the ECs it is constantly rubbed by the wires, I could see the wear marks. I scrap it and just run a crossover line in front of the fuel tank, the way my '00 XC250 came. I also ran a 1.4 bar cap, LTR impeller(my OEM was plastic), with no problems EVER.
Just run the EVANS coolant, problem solved.
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