Posted by WD on August 12, 2003 at 09:08:41:
In Reply to: raask/rejet? taking the plunge posted by TomCat on August 12, 2003 at 00:15:42:
Buy the next two sizes, and see which gives you a cleaner fuel burn. Jet sizing is altitude sensitive, and what works at sea level won't work the same at even 1000' elevation gain. Play with the jet sizing and the mixture screw setting until you get a nice grey/tan color on your center electrode (color changes with different fuel formulas, compare with your older known good plug's color). It is a good idea to switch the sparkplug at the same time. You may need to play with gap sizing to get the bike fully dialed in, and a new plug or two lets you get a truer reading than sanding and reusing the same plug over and over.
-WD