Well last week I got myself a brand new radiator for the KE70 to fix my temperature issues. Also figured I'd do the top and bottom radiator hoses and a thermostat. Mechanics at work today weren't overly busy as a few people canceled jobs, Asked them if they could do it for me and they did. When running it to get the thermostat to open they noticed the backfiring sound I get every now and again, Immediately they said it would be valve related. They did a compression test on it and it was something like #1 50 #2 50 #3 80 #4 100 - Diagnosis, Burnt valves.. They adjusted the valves up for me and it has stabalised the idle thats been all over the place, Now I'm going to have to rip the head off too see what needs to be done..