cutting out?

[SKOAL400_311]

my fourwheeler is a 400ex and when i am sitting in nuetral or in gear with the clutch in and i hammer it it will die....know what could be wrong
it did this before and after i had it rebuilt

[SKOAL400_311]

anybody?
wel i went to start it today and the damn thing wont even fire up
i think it may be a fouled plug..any tips on changing that thing to make it easier?

thanks for any help

[JOEX]

18mm 3/8 drive deep well socket with the short extention works for me just fine. The only "trick" is to put on the socket first then the extevtion then the ratchet.;)

Change the plug and clean the air filter then see what happens. If you still have problems your jetting/carb may need tuning.

Joe