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Message: [QUOTE="whenfoxforks-ruled, post: 1324802, member: 73147"] Them fine wire plugs foul less than the fat ones, believe it or not. Most of the time when you foul a plug, its from not clearing it out good, wide open runs. BUT, you have bikes that generally came richly jetted to begin with, and used and abused bikes. Now with an abundance of oil on start up, that fat electrode es plug will fire and the fine wire will foul. I believe this is where the messing with the oil ratio comes in. Before investing stock in NGK, make sure the rest of the engine, carburation and exhaust are mechanically ready! Then read the plug/temperature? For starters: [url]http://en.wikipedia.org/wiki/Spark_plug[/url] [/QUOTE]