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View Full Version : My 400ex Is Back Firing !!!!!!!!!



XTREME-400EX
01-15-2005, 12:02 PM
DOES anyone know why the bikes back fire, some people toll me is bcs my carb its dirty, i havent taking it apart yet all i did was take the air intake hose and spray some carb cleaner in there still back fires once in a while :confused: and my my spark plug goes bad every 5 hours of running time i dont know i guess i need alot of help !!!!!!!!!!!!!:confused: :confused:

nosliw
01-15-2005, 12:25 PM
mods?

XTREME-400EX
01-15-2005, 12:40 PM
what does mods means ?

cals400ex
01-15-2005, 12:47 PM
what modifications (mods) do you have on the bike?

awsomeaussies
01-15-2005, 10:38 PM
I had the same problem with my 400. It would back fire everytime I'd start it and I'd go through spark plugs left and right. The motor was completely stock. And as soon as I cleaned out the carb, it solved the problem!;)

XTREME-400EX
01-17-2005, 11:14 AM
im going to wait a couple of days so i can buy a jet kit so i can ake apart everything at the same time do you think i need a jet kit i dont really know how it works ???????????????

awsomeaussies
01-17-2005, 02:51 PM
You don't need a jet kit if your engine is stock. If you got an aftermarket exhaust you'll probably need to change your jets.

rippen_honda400
03-19-2005, 11:15 PM
check your exhaust valve it might be stuck, mine was doing that too and i found out that my valve was stuck open, or you might have an exhaust leak some were, check your headers,

400exredrider
03-20-2005, 09:38 PM
what are the plugs looking like? grey or wet black or brown?

EXDUNER127
03-22-2005, 02:30 PM
either u need to take your carb apart and clean it from the old gas gunking it up, or you are running to lean! and dont buy a jet kit they dont do anything, i ran better w/out the only good thing was the needle, but the jetting sucked!

Joe400ex
03-22-2005, 08:31 PM
it could be the jetting with the air mixture and gas flow i am asewming:ermm: