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18-10-13, 10:57 PM

The numbers refer to heat range of the plug. The 6 will run hotter than the 8 under the same conditions.
What does the end of the plug look like? Too hot could cause pre-ignition (spark knock) and piston damage. Too cold will foul with fuel or oil.

18-10-13, 10:57 PM	#2
wideguy Guest Posts: n/a	Re: Wrong spark plug? The numbers refer to heat range of the plug. The 6 will run hotter than the 8 under the same conditions. What does the end of the plug look like? Too hot could cause pre-ignition (spark knock) and piston damage. Too cold will foul with fuel or oil.