I just rode 100 miles today
Air temp is 78 degrees
My Power Vision showed Engine Temp @ 288
Just for grins I stuck my thermometer in the oil tank it read 250 degrees
Next I grabbed my wife's cookie thermometer it reads the same
I am confident in the M8 engine
With 15,600 miles I have had ZERO problems with this new engine design
I am running 90 octane alcohol free gas with No ping
The knock sensors do a great job retarding the spark
I run my Love Juggs Mighty mites All the time to push the hot air away from the spark plug area The hottest part of the heads