Scooterotica

What effect will installing a variable ignition have on EGT and CHT readings? Will the exhaust gas temperature increase as the timing retards?

Yes it will and the cylinder temp will fall but it will be a bit slower to react. You will have plenty to occupy your mind on long roads

EGT often goes up as the retarded timing means that more heat is put into the pipe, which is what it is designed to do as it represents heat that is being taken away from the cylinder (cylinder stays cooler but EGT goes up).

Thanks for the clarification. Yes, plenty to keep my mind occupied on long roads.

Previously on long rides I've aimed for EGT readings between 500-600*C and set the EGT to flash a warning at 650*C. Given the goal posts have been moved (for lack of a better analogy) with the variable ignition, what would be the ideal temperature range be now?

I know that it is near impossible to compare EGT readings across different scooters, given all the variables that need to be taken into consideration (probe location etc...) but I'm looking for a 'ballpark' range. On the scooter in question the k-probe is located ~100mm from the piston skirt.

Thanks again!