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A  lot  more information  is  needed before  anyone can begin to try to help  you .  There  is  a download  of the  service manual  for  the  400ex in the  forum's archives .. Go to  Browse  at the top  then   click  downloads  and   click through  to  the  Honda section  service  manuals.   If  the  motor  turns over ,  check the  spark  plug  for  spark  and  the  carb is getting fuel.  If  it doesn't  turn  over, then  check battery,   fuses  and  neutral switch   for starters..  Then    use the   service  manual  as  a guide  to  check  other components .

 

 

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