i keep fouling my plug?

[fast4Exr]

what's going on here? i keep going through plugs almost right after i put them in.




400ex,white bros e2, magnum rev box,155 main jet, pep's with rezzies.stock air filter

[400ex men]

i think what it is is your jetin is not right go to a atv shop and let them do it re jet it is what i wood say:)

[hondarider2006]

go down to a 152 mj and see what happens.

[sickmojave]

that jet sounds about right so I would look for other reasons that would cause this.Is your airfilter clean? what does the plug look like?

Keep your hands off the dam choke....:eek:

[hondarider2006]

Originally posted by Rico
Keep your hands off the dam choke....:eek:

or just take it off;)

[awsomeaussies]

my 400ex was fouling plugs constintly too. I clean my carb and that fixed the problem.

[cals400ex]

i would pump the throttle 4 or 5 times before trying to start the bike. then just hit the start button withOUT hitting the gas any more.

[Syrus]

Originally posted by awsomeaussies
my 400ex was fouling plugs constintly too. I clean my carb and that fixed the problem.

While putting it back together you adjusted the jets, and thats all u needed to do :P adjust to the jet, your getting to much gas if your fouling the plugs am i right ?

[fast4Exr]

so you are saying that my jetting is to rich?

[hondarider2006]

Originally posted by fast4Exr
so you are saying that my jetting is to rich?


possibly, go down on the mj a size or 2 and see what happens from there. And like Rico said, stay off the choke brotha. As a matter of fact, just remove it, install a 42 pilot, go 2 1/2 turns out on the mixture screw, and your cold starting problems will be solved;)

[fast4Exr]

what is the best plug to use?

[plkmonster2]

What I don't get is why people have to pump the throttle. My 400ex needs no throttle or pumping to start. Hit the starter, and it fires to life. My uncle has a 400ex that he slightly opens the throttle and it starts fine, but why do some people do that? Just wondering...

[hondarider2006]

Originally posted by plkmonster2
What I don't get is why people have to pump the throttle. My 400ex needs no throttle or pumping to start. Hit the starter, and it fires to life. My uncle has a 400ex that he slightly opens the throttle and it starts fine, but why do some people do that? Just wondering...

Us people that pump our throttle have the choke removed. Easier than fighting the stupid thing until it gets warm;)

[Steve-o 400EX]

Originally posted by hondarider2006
possibly, go down on the mj a size or 2 and see what happens from there. And like Rico said, stay off the choke brotha. As a matter of fact, just remove it, install a 42 pilot, go 2 1/2 turns out on the mixture screw, and your cold starting problems will be solved;)

That'd b my recomendation too.