On a gen 1, what is the orientation of the inlet and outlet hoses to the expansion tank? I would think the hot overflow coolant would be pushed into the top of the tank and then be pulled back to the radiator from the bottom.
Mine is trying to push the coolant from the radiator into the bottom of the expansion tank.
Someone may have switched them at the radiator neck.
2017 Royal Enfield Continental GT 535
I ride bikes cause four wheels are much harder to lean🤪