I installed the temp [ plug] sensor on Ts250 today,,, Ran 15m;s outward & 15 back ,
First run with NGK B7ES [ standard for model] ,
Results,,,,, @ 50mph reading- 315 *f ,,, At 60 uphill, it maxed at 337*f.
2nd run- NGK B8ES reading- @ 50mph 280*f... @ 60Mph up hill = max- 308*f.
There was no difference in performance, only cooler , Gonna try jets next... Interesting stuff,