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strange new problem

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lately I have been fouling a lot of plugs.. I mean one a ride or more... This is what I have noticed Put in a new plug go riding bike runs fine live it set till it cools down 30 maybe 45 min. When I start the bike bingo fouled plug.. while the bike is setting I leave the gas pitcock turned on.. other than that I don't touch it... I cleaned the carb still no good... I need help my old 2 strock was easier on plugs..

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try a different manufacturer. go to a softer plug ie 8 down to a 7 while you find out the real problem.

Taffy

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Possible float problem, turn your gas off when you park it. Use the hot start when you restart it. See if the problem stops.

Post your jetting - pilot, pilot screw, needle, clip position. YZ/WR cam timing? Exhaust? Model and Year?

Minor adjustments like turning IN the pilot screw or moving the needle a clip position leaner may be needed.

There are lots of jetting tips on this site if you search back.

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This is stock jetting for '98/'99WR's. Unless you are at high altitude or hot temperatures, it should be ok. If you are doing alot of low speed running, the DTM#3 could be switched to DVP#4 to lean out from 0-1/4 throttle. Other things like float height or an over-oiled air filter? Make sure the pilot air jet is not clogged and the choke is closing properly if you take the carb off again.

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