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400ex wont idle! pops
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Posted by: j2smith

i just recently bought this 2001 400ex. i realy like it but it wont idle at all. it had been setting for a while so i drained the gas out and put new gas in and replaced the spark plug with no change. u can ride it and it runs ok but it wont idle at all and it pops back through the exhaust.i would apriciate any help. also where is the air/fuel mixture screw?

Posted by: nosliw

carb probably just needs cleaning.

make sure to get all the jets, the floats, needles, ect...

Posted by: DieselBoy

compressed air through the carb jets/float bowl/etc.

(take it apart) - not too much pressure, either.

Posted by: j2smith

I TOOK THE CARB OFF TONIGHT AND CLEANED IT THE BEST I COULD. WHAT ADJUSTMENTS DO I NEED TO MAKE? WHERE IS THE ADJUSTMENT SCREWS?

Posted by: j2smith

U can screw the idle screw all the way in and it makes no difference.

Posted by: DieselBoy

make sure you cleaned the jets, if they don't get the needed fuel it simply won't idle. Also, drain the tank and shoot some air in the fuel line.... there could be some fuel restriction.

Posted by: 315thrider11

Just what i would do

is clean it which you have done that

make sure the air fuel mixture screw on the bottom is

2 1/4 turns out and adjust if needed

make sure the idle screw inside the carb is touching and having

a purpose i unscrewed mine and it had the same effect your explaing

and it was because of the idle screw not being as far needed to

have its purpose

Jim

Posted by: krt400ex

if it pops its probably too lean. go up a couple mainjet sizes and see if that helps.

Posted by: DieselBoy

definately lean. float bowl/needle may be stuck.