If it’s over 2 bar (kg/mc2) at idle it’s not bad, when hot after a long run it will probably go to between 0.5 and 1.0 kg/mc2 (7-14 psi) at idle which Andy Burnett told me is fine……. Yours at 2.25 kg/mc2 is 32 psi
As for water temperature, there is no thermostat in the system, so it takes a mile or 2 before the gauge even moves, even in summer 😮
Anonymous