Originally Posted by timjs

150? Where and how are you temping the engine? 150 is way too low if that's true. Although the engine would be running absolutely pig rich to achieve that, even in cold windy ambients.
If it's correct, wrap the head next time. Minimum temp 200f. Maximum temp isn't so important.

Originally Posted by Jerm13

With an air temp of 35*, 150 isn't as bad as you think....As long as the motor was running good with smoke, it should have been ok.
Now adding a layer of foil tape to the bottom 2-3 fins would help out in bringing temps up, that cold of weather you wouldn't see much higher than 200 anyway on a properly tuned motor. This is why you don't tune "with head temps alone."


And putting a hotter plug in probably would have helped and lasted a lot longer..

Originally Posted by timjs

I don't tune to temps. I always advise against it. But 150f is too cold, regardless of ambient temps.