Thermostat was not replaced, I just got one and will refit it. All 03 mounts replaced.
Detonation means extra sound "krata"..."krata' coming from the engine in addition to it,s normal sound. As per Mr Alawatte, there is no timing adjustment for Fuel or ignition for this model. Valve timing can also be a problem ?. Petrol consumption also seems high last fill clocking 10km/lit only.