Hello,
After about an hour of hard riding on my 2007 yfz 450 the overheating light comes on. I put a new rad cap on but still the same issue. The plug doesn't show any signs of it running lean. Fan working fine. Water pump seams fine. Temp light not faulty. Any ideas of what could be causing it to overheat?
Cheers.

 

Try using a commercial flush on the radiator and make sure the fins on it are cleaned out. If it takes an hour to show up maybe you shouldn't ride it so hard, he he..

 

Thanks for the reply. I will try that and report back. It you drive it easy it will overheat eventually, its not only when driven hard!