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View Full Version : Sputtering over whoops



Phil Albright
05-04-2003, 03:19 AM
Can some please help...

My 400EX has suddenly started cutting out over whoops. The bike also seems to be a "slug" on the bottom end( most likely because of the rich condition it is running under).

The spark plug is black...I have had the same pipe and jet combination for over a year and it has been fine. Just suddenly started breaking up and I am curious as to whether or not anyone else has experienced this problem and how they have fixed it.:confused: