Stock Carb Problem

[maxxemracing]

ok guys help me out my carb has been actin funny ever since i took it out. i had to take out my carb and clean it out after som bad gas so i put it back on and if i hit the as hard from idle it jus shuts off like its gaspin for gas. it runs fine it you slowly get on the gas from idle, and you can punch it if your over 3000 rpms i think the accellortor pump is messed up how do i fix it

[Speedy81304]

the accel pump. is not adjustable. recheck everything that you did. i must have over looked.

[cals400ex]

what all did you mess with and change?

[maxxemracing]

i took it sprayed it with carb cleaner then turnde it upside down to get all the gas out then i took the bottom of and sprayed it with carb cleaner and put it back to gether

[maxxemracing]

i know its not ajustable i just want to know how it works so i can fix it

[Colby@C&DRacing]

Try to clean it again, take the jets out fuel screw out ect.. spray carb cleaner in them and the circuits. this should help.

[maxxemracing]

ok ill try that again right now

after you spray cleaner in all the jets and little holes i know its nasty but you hve to blow threw them to make sure it still isnt clogged, i was cleanin a carb off of a 3 wheeler once and i spent all day just tring to uncloged whatever the f got in the piolet jet

[maxxemracing]

alright i have both jets cleand mixture screw clean just about everything still no little squirt of gas when you pump the throttle

[cals400ex]

Originally posted by maxxemracing
alright i have both jets cleand mixture screw clean just about everything still no little squirt of gas when you pump the throttle


are you sure there is gas in the carb when you are hitting the thorttle to see if gas sprays out???

[maxxemracing]

yes
i jus put the carb back on an rode it too just to make sure and still bogin from idle to wot but anywhere above idle to wot its fine i am getting agravated

[cals400ex]

did you remove any of the jets or just spray in them? its alright if you just sprayed in them. i just want to make sure you didn't remove any and a piece could have fallen out that you didn't see. did you put in the little plastic piece back in that rests over the mainjet?

[cals400ex]

this thread shows the stock carb. take off the screws holding # 17 on and clean the pieces. there isn't much to it. this is the accel. pump


http://www.exriders.com/vbb/showthread.php?threadid=64555&highlight=needle

[maxxemracing]

thanks a ton i have been lookin for that for a while now

[maxxemracing]

i have taken that of a couple times now and sprayed carb cleaner all over it
what do you think could be wrong

[Speedy81304]

i removed the choke and filled in wear ths shaft went with J-B weld and then smoothed out the bell of the carb, by removing all the rough edges.. then just tuned the jetting.

sounds like even though you cleaned it its still clogged, go cut a pice of wire off a steel brush and stick it up in there thatll get it out :D

[cals400ex]

i have no idea what could be wrong. just make sure everythign is installed properly. i would have to see it myself to come to any other conclusions

[maxxemracing]

well thanx for trying to help i guess i will jus take it to my dads work and have it sonic cleaned maybe one of then engine builders will have a peak at it and fix it. he works for penske jasper engines. they build engines for rusty, ryan newman and travis kaphil (sp)

[maxxemracing]

ok still stumped i took it of again today and had the pump all apart cleaned it agian and took the air compresser and blew it all out and then i filled the carb with carb cleaner and pumped the gas and it worked! put it back on extremely carfully put everything back together and cranked it up. guess what........ still bogin from idle to WOT took of the boot and guess what no sqirt ima bout to go throw it off a cliff and get a 450r carb. or a used sparks fcr but u guys got any more sugestions

[cals400ex]

so the fuel line is hooked up to the carb i assume? you may need to hold the throttle lever in for a few seconds too. if it isn't shooting gas, something is wrong. i would clean out the hole that the gas shoots from. i am assuming the accel pump is installed properly and it appears that everything is in good shape?

[maxxemracing]

i finnaly got the thing workin it was the brass tube that the gas squrits out of that was clogedi finnaly just let the compresser get up to 150 psi and blew the tube out and some how a flies wing had got in the tube dont ask me how.but apparently that wasnt the only thing wrong with it it made my situaton better but it still is wanting to shut off when you go from idle to wide open i took out the choke to today and kept the 40 jet in it .i keep my 400 in the garage and its always heated in the winter so im not worried about starting it but anymore info would be greatly appreciated.

[cals400ex]

it sounds like you're ready to go

[maxxemracing]

but its still wanting to shut off. my main jet is 170 my pilot is 40 and the pilot screw is turned out 3 rotations.

[cals400ex]

what needle clip position? all keihin jets?

[maxxemracing]

klehin jets
second from top positon

[cals400ex]

you definately won't want to be in the 2nd from the top on the needle clip. that is a leaner position than stock. the stock position is the middle groove. most run it in this groove or one down from here.