I have been inspecting/cleaning and regapping my NGKs at 100 hours and replacing at 200 hours for 6 years and 700 hours now on my 912uls with no problems. I use non-ethanol mogas almost exclusively.
My 912ULS, with total time of about 182 hours has been running about 170 degrees F. Today, I had one at floating from 117 to 132 and the other about 170. I do run 50/50 coolant.
Thoughts as I have not noticed a significant difference between these 2 cylinders?
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