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Message: [QUOTE="john stu, post: 991962, member: 27637"] if your plug is white after riding at full thorttle and quickly shuting down the engine and pulling the plug you NEED a bigger main jet or you might seize the engine .if the bike wants to foul you need to try raising the needle clip and or a smaller pilot because if you get a white plug after riding full thorttle its sure not your main i would put in the #8 plug (i ran one in mine and it fouled less and the bike never had any problems) but i would not put in the hotter plug until you put in a bigger main jet and get at least a light tan or darker color...........if your bike fouls most likely its not from the main its form the needle clip postion and a little form the pilot. to get the correct size main jet ride the bike as you would normaly ride through the gears on a straight and start in first and go to at least forth gear if you can, and at the very same time pull in the clutch and hit the kill switch then coast to a stop with the clutch still pulled and pull the plug and check the color it should be tan, brown,even dark brown or light tan is good but NOT white if you bike fouls when trail riden its from the 9 plug needle clip postion and pilot jet NOT THE MAIN JET start with the main jet and work you way down main, needle clip, pilot, air screw and after changing the needle clip check the main again it might change a little [/QUOTE]