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Message: [QUOTE="Rich Rohrich, post: 221909, member: 16241"] Sorry but that won't work. Plug readings are useful for jetting the main, determining plug heat range, verifying ignition timing, and spotting detonation, but you'll never be able to accurately read the mixture strength of the low speed circuits . The following links should get you the info you need on jetting: [url]http://justkdx.dirtrider.net/carbtuning.html[/url] [url]http://justkdx.dirtrider.net/jetneedles.html[/url] [url]http://www.ericgorr.com/techarticles/carbtuning.html[/url] [url]http://www.ericgorr.com/techarticles/sparkplugs.html[/url] [/QUOTE]