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Spark Plug Information

5024 Views 3 Replies 3 Participants Last post by  Bill Grinley
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2300 people have viewed this link- but with no clarity on what plug to use, and Jacks offering no info on it either, are people just as confused, or am I missing the obvious?
NGK DPR8Z is what I use - what I prefer is Nippon Denso X24GPR-U - in a pinch I use AC Delco 4163 - for racing I use DPR8ZIX - no other spark plugs are listed as exact replacement for the 400EX and 400X - there are other plugs that will fit the threads, but not the design feature The DPR8Z, DPR8ZIX and X24GPR-U are the only ones you will find in my garage or tool box
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