honda 400ex back firing at top end. - ATV Forums at ATV Rider Magazine ATV Rider

honda 400ex back firing at top end.

  
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honda 400ex back firing at top end.

 
redhotspark redhotspark
New User | Posts: 1 | Joined: 11/09
Posted: 11/05/09
12:53 PM

1999 honda 400ex stock except white bros exhaust. back fires top end. fuel fouling the plug have changed plug 3 times coil and cdi box. same result.  

 
wolf1 wolf1
Guru | Posts: 1843 | Joined: 11/07
Posted: 11/06/09
09:16 PM

do a plug chop, changing the exhaust means most times you need to rejet the carb.

checkout the jetting 101 post under atv repair and maintenance.  

 

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