i have a 00 wr 400 starts from cold first kick but only runs for 5-10min then starts banging jumping and cut out , last sat i took bike out for a run 30 miles and back put new chain on and went out again 5min into the run it started banging , today i changed oil ,filter,air filter,new plug but still no good ,

anyone know wats up THANKS

Did it just start doing this "banging" or develop over a certain time? It is getting worse? Does the motor sound good when cold? How many hours are on the bike??

Could be a stator issue - could be loose??

Can you define banging? Do you mean like backfiring, or is it a mechanical type noise? Makes a huge difference in trying to help diagnose the problem.

+2 on the stator.

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