my original carb was all messed up, no choke plunger, it ran ok with it, but i had no air box ither. so i bought another carb off ebay, had the plunger and cable, also bought an airbox, it will not hardly run , start , really anything, occasional it will start and run but it bogs badly and backfires, the original carb has a diffrent needle jet then the other carb. the one i bought looks to be in awesome shape, the needle jet is longer in it, and the adjustment screw on the outside is 1 turn out. i appriciate any help , im not that good at jetting carbs,
by the way i live in charleston wv i know altitude has a diffrence
thanks brandon

 

Take the jets out and clean them good

 

ok it will run on half choke, the air box is on now with no filter, still not idle'n and still bogs some, but i can ride it down the road.
I also moved the needle jet up to the top notch, it will bottom out in the jet if i remove the little plastic o ring under the e clip, but i didnt remove it, its also the longer needle jet that came in the better carb.
i mixed the fuel 32:1 because the oil pump is broken right now, 89 octane
also if i let the revs drop down to almost idle and give it some throttle it will bog out and die
What should i do next ?
thanks brandon

 

so thid carb was not on a 400? if not then chances are it's a differnt size (example: a 38 mm when you had a 34mm these are just numbers i threw out there) in which nothing is going to work unless you change every thing in the carb like the needle jet, the main and pilot jet to make it run correctly. also these are made to run w/ the restriction on the air box and filter in them, which would make it run rich in the first place. hope that helps.

 

yea the carb was from a sportsman 400 , exact same carb 34mm , mikuni
the jets may be diffrent , i couldnt really read the numbers, but the better carb, the one im using now has the longer needle jet in it, the previous carb may have been from a 250 or something ?
im really unsure maybe i can take the carb back down tom and snap some pics
thanks brandon

 

if its the same carb you should be able to use your parts(if there good) into the new carb you put on and have it be rigt as long as your needle will be set at the same height. here are the numbers for the jets for the 96' xpresss
pilot-#30, main-#210, needle jet-#480, JET NEEDLE,6-DH29 (6DH29-3), this is off the carb breakdown. hope it helps.

 

the old carb needle jet is 5n7, the newer carb that seems like the number that were on it, can u tell me what notch to set it on ?
thanks for the carb break down
as i recall one jet said 30 , on the newer carb as well.
thanks brandon

 

where is the number on the main, also how do i check the needle jet,
thanks brandon

 

the old carb main jet is 130 or thats what it says on the bottom

 

the needle jet is 480, all these number are from the old carb, also looks like the pilot is a 30