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gimpbzkt400ex
03-05-2004, 03:50 PM
I have a 400ex with a e-series slip on, uni air filter, #42 pilot and stock main jet... my plug is showing I am running rich? how many turns out do I need to go on my air/fuel screw? to lean it out a little...thanks..
cals400ex
03-05-2004, 04:50 PM
you just need to be 100% sure your rich on the idle circuit and not the needle or main circuit. if your sure, you need to look at the very bottom of the carb. facing vertically on the bottom of the carb you will see a little bronze color skrew. you will adjust it with a flat blade skrew driver. you will want to turn this skrew in some to lean it out. this is like a fine tune adjustment for the idle circuit/pilot jet.
gimpbzkt400ex
03-05-2004, 05:25 PM
Originally posted by cals400ex
you just need to be 100% sure your rich on the idle circuit and not the needle or main circuit. if your sure, you need to look at the very bottom of the carb. facing vertically on the bottom of the carb you will see a little bronze color skrew. you will adjust it with a flat blade skrew driver. you will want to turn this skrew in some to lean it out. this is like a fine tune adjustment for the idle circuit/pilot jet.


wonder what would be best?? like 2 1/4 turns or what?
03-05-2004, 05:26 PM
yup make sure its the piolt u wanna adj.;)
cals400ex
03-05-2004, 05:28 PM
what is the temp your riding in and what is your altitude? you running the air box lid on?

usually around 2 or 2.5 turns out is good.
gimpbzkt400ex
03-05-2004, 05:28 PM
Originally posted by Jingle
yup make sure its the piolt u wanna adj.;)

yeah I am pretty sure it is the pilot... so 2 1/4 turns is where I need to be?
gimpbzkt400ex
03-05-2004, 05:30 PM
Originally posted by cals400ex
what is the temp your riding in and what is your altitude? you running the air box lid on?

usually around 2 or 2.5 turns out is good.


I'm in West Virginia the temp right now is about 65 and the altitude according to my GPS is anywhere from 950 ft to 1200 ft...
gimpbzkt400ex
03-05-2004, 06:04 PM
how do you get a screw driver into that little space to turn the mixture screw? or do you take the carb off and turn it upside down?
mustang93
03-05-2004, 07:04 PM
I just use a 2" long screw bit out of a cordless screw driver.
gimpbzkt400ex
03-05-2004, 07:10 PM
Originally posted by mustang93
I just use a 2" long screw bit out of a cordless screw driver.


hmmm.. I never thought about that...
mustang93
03-05-2004, 07:15 PM
thats also how I change my main jet w/ carb on bike. 1/4 wrench fits the bit for extra torque ;)
gimpbzkt400ex
03-05-2004, 07:18 PM
Originally posted by mustang93
thats also how I change my main jet w/ carb on bike. 1/4 wrench fits the bit for extra torque ;)



hmmm... cool... thanks for the info....:D
cals400ex
03-06-2004, 12:24 PM
it will probably be easier for you to remove the carb the first time. this way you know how many turns your going out. if your trying to squeeze a little skrewdriver down there it will be tough to figure out how many turns out your going. i use a skrewdriver instead, but i also know how many turns out i am before i tinker with it.