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Z dies after i rev it up or when i stab the throttle..Help!!!
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Posted by: New-400ex_guy

stats: ct full pipe, k&N filter with no airbox lid, 155 mikumi main jet, 4th clip down on the dynojet needle, 3 turns out on the mix, 25 pilot.

well i dont know whats wrong. it runs like a raped ape but if im stopped or sometimes when im going if i nail the throttle it will die when i let off and pull the clutch in or when im in neutral and do the same thing. also if i try to stab the throttle real quick it will just die. ive tryed messing with the idle but it does not good, i recently went richer on the needle and put a bigger main and it rocks in mid and upper ( although i probly need to go a bit bigger on the main.

could it be my pilot? i went from the stock 122.5 to a 125. i cleaned the carb out and it helped.

weird thing is if i put it on half choke i can stab the throttle and it wont die.

what do you guys think, does it die if you just wot then let right off. sometimes it doesnt happen and sometimes it does on mine.

dam where is my fuel injection

Posted by: Rider#11

is your air filter cloged? check your plug?

Posted by: New-400ex_guy

air filter was just cleaned and i dont think over oiled, plug is barley tan, but i went up on the main and almost got rid of my stumble there ( need one more size up probly ).

Posted by: Derek

what do you expect.........................j/k no flame intended

Posted by: stupid driver

sounds like an intake prob to me. i had this happen to my ex today. i went muddin yestaday, forgot to clean my filter and let out the water, and every time id go over a jump and the water in my air box was swept bak my 400 wud die. not kool. took out 5 minutes of good ridin

Posted by: airheadedduner

Check your needle clip. It could have fell off so when you hit the throttle it just dies, no fuel.
My R did that before.

Posted by: Z400central

i think its an intake problem also....

Posted by: lil400exman

quote:
Originally posted by New-400ex_guy
stats: ct full pipe, k&N filter with no airbox lid, 155 mikumi main jet, 4th clip down on the dynojet needle, 3 turns out on the mix, 25 pilot.

weird thing is if i put it on half choke i can stab the throttle and it wont die.

dam where is my fuel injection

well that obviously says your running to lean casue the choke richens your mixture

that simple!

Posted by: lil400exman

aslo when you really get on the gas another jetting problem casue you are starving your motor of fuel casue its burning in the motor and you jet cna not produce enuff to compensate casue it is to small geeze people.....