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[QUOTE="bigred455, post: 718169, member: 19827"] I know the majority of you have seen plug pics and know with a new plug looking at the tip of the insulator is useless,so read over what you already know . If anyone has read Gordon jennings article on spark plugs it is a very good read.He mentions checking the mixture ring down at the base of the insulator for checking your main jet . I see a lot of riders telling other riders that if the insulator on the spark plug is white you are running too lean.They do not bother to ask if it is a new plug or used plug.The reason I say new or used is,you will not color the insulator up by the tip if the plug is new it takes some time to color that area of the plug .You can be running 5 sizes too rich and you will still not get color. If you listen and feel your motor it will tell you everything you need to know,but you have to put in the time. I do not like to jet by the plug color, their are too many variables involved, different oil and fuel properties DIFFERENT COLOR READINGS. Gordon Jennings talks about the fuel mixture ring down at the base of the insulator and he is correct. I will prove his article is right on the money in the plug pictures I have taken on my 03 kx250. The only thing I did not agree with is how the ring is suppose to climb higher the richer you go. I found out that the richer you go the darker the ring becomes not higher. I warmed up the motor with my plug I use at normal riding conditions BR8EIX shut it down and put a brand new BR8ES the first run and a brand new BR8EG THE second run. As soon as the motor was running I went off and did 3 fast passes reached full throttle held for 5 sec and repeated with the new 2nd plug. I had my jetting all sorted out weeks before this test,like I said I like to jet by trial and error but hey I was curious. The pic on the left is with a 148 main this is what I chose just by listening and feeling the motor I got her right on the mark and the plug does reflect that. The plug on the right was run with a 152 just to see if the mixture ring did change. If you are jetting by the plug color you are wasting your time looking at the insulator tip. ENJOY! Keith 455. " LET'S JUST RIDE" [URL=http://www.locastros.com/plug_pictures.htm]pictures[/URL] [/QUOTE]
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