220 - 230F. still on the reach setting , it is good to have from 250-270F. it will give you good punch(depend on the low end) and top speed specially if you running on road. But don't go beyond 280F and up as you will run it lean then suddenly will snap the con rod. Better to use venom temp gauge or the water drop to check the temp (Others call it the spit test[:'(])