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400ex missfires and spudders

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Old Oct 12, 2005 | 02:46 PM
  #1  
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Default 400ex missfires and spudders
My 400ex will missfire or spudder in the higher rpm range. I have reset my valves and it is still doing it. what else should i check
 
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Old Oct 12, 2005 | 03:04 PM
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Default 400ex missfires and spudders
Choke ?
 
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Old Oct 12, 2005 | 03:09 PM
  #3  
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Default 400ex missfires and spudders
No
 
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Old Oct 12, 2005 | 03:21 PM
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Default 400ex missfires and spudders
When did it start diong it?
Did you wash it....change a plug...clean the a/f....add an exhaust
 
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Old Oct 12, 2005 | 04:07 PM
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Default 400ex missfires and spudders
It started about a week ago. I did not wash it or ride in water. I put a new plug in it last night. The filter is clean and nothing has been done to the exhaust.
 
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Old Oct 12, 2005 | 05:12 PM
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Default 400ex missfires and spudders
did it run fine before?
ANd how high are the rpm's?
is it while you ride or while its sitting?
 
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Old Oct 12, 2005 | 05:29 PM
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Default 400ex missfires and spudders
It was running fine before
It idles good but will start to miss about half way through the throttle when you are riding and when you rev it out of gear
 
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Old Oct 12, 2005 | 05:38 PM
  #8  
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Default 400ex missfires and spudders
same thing happened to my frend still dont no wut it is.
 
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Old Oct 12, 2005 | 06:09 PM
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Default 400ex missfires and spudders
Did you rejet it recently?
 
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Old Oct 12, 2005 | 06:37 PM
  #10  
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Default 400ex missfires and spudders
no
the bike is stock
 
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