cbus good idea to use an optical thermometer. Decided the best point to aim was the drain plug. That has been between 95C and 100C while I've been driving errands today. Looks like the meat thermometer wasn't too accurate (explains the burnt chooks!). 1500king thanks for the extra info on the carbies. I thought it wouldn't hurt to make the idle a bit richer - there are so many traffic lights these days, so a lot of time spent idling. Good news is that my "SaveMyBug" hot oil sensor still hasn't gone off since I blocked off the heater fan holes. And the engine is clearly running cooler.