have a 2001 400ex that was runing great in the morning but then it just acted like it ran out of gas and bogged down and quit. Have gas into it. Gas in ON. just rolls over nad over and over with out firing. i do have spark. The plug is old tho. maybe not enough spark? But why would it just quit in the middle of a ride? Any help would be great thanks!
2001 400ex crank but no start
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Cosco please avoid making duplicate threads, it confuses people. As for your problem, are all of your connections clean and tight? Battery cables and all of your wiring? I would try changing out to an iridium plug for your EX I put one in my 300 and it hasen't needed changing since, and that was 4-5 years ago 
I'm 98.9% confident its a wiring problem.
I'm 98.9% confident its a wiring problem.1 - 2 of 2 Posts
