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Old 08-15-2013, 04:08 AM   #1
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98 arctic cat 400 fis, dont know where carb hoses go

i have a 98 arctic cat 400 4x4 and have no clue where the two vacuum hosesfrom the carb go to on it. they just rugn up to the handlebars and dont hook to anything, and the crankcase vent to. it wont run without help and dies after a few seconds. does anyone know where these hoses should hook to??
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Old 08-15-2013, 07:35 PM   #2
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got it running

ok so i took the 2 vacuum hoses from the carb and hooked them into the crankcase hose assuming thats where they went, i dont know if my choke cable is broke or what but i casnt seem to figure out how to hook it up so the choke is stuck down on full choke. but it runs now, and runs halfway decent but doesnt like to idle and does miss some. and it is spitting ALOT of gas out of the little hole on the bottom of the inside of the outlet on the carb, a friend told me it could be the float sticking but ive cleaned the carb several times. can anyone help please? i dont have the money to take it to a shop
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Old 08-15-2013, 10:10 PM   #3
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Don't hook the line from the carb to the crankcase line. If it is a bigger line, it is the bowl vent. Blowing in it or sucking on it makes it run rich or lean. It is just a vent and can not be plugged. Not sure what other line would be coming from the carb and hooked to nothing. My 03 only has the one vent line. The other is the fuel inlet.

You need a new float valve. The bowl is over filling causing it to run out the overflow on the bottom of the carb. Or the float is set too high.
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Old 08-16-2013, 12:02 AM   #4
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carb problems

well both of the lines from the4 carb are the same size. and the crankcase one is bigger. and they all run up to the handlebars. and before i hooked them into the crank vent it wouldnt stay running. it has two vent hoses on the top where the marks are on this pic. and the gas is not spitting from the drain plug for the bowl its coming from the little hole on the bottom of the outlet lip. if i stick my fingers in there and hold up a little on the needle in there while its running it seems to smooth out some
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Old 08-16-2013, 09:17 AM   #5
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 Quote: Originally Posted by kyle_keys View Post
well both of the lines from the4 carb are the same size. and the crankcase one is bigger. and they all run up to the handlebars. and before i hooked them into the crank vent it wouldn't stay running. it has two vent hoses on the top where the marks are on this pic. and the gas is not spitting from the drain plug for the bowl its coming from the little hole on the bottom of the outlet lip. if i stick my fingers in there and hold up a little on the needle in there while its running it seems to smooth out some
Just vent lines that Definitely should NOT be all connected together. the vents are the Crankcase vent, the Bowl Vent and the Diaphragm Slide vent in your case, Some carbs have only one vent line to the bars. Yours has two. No big deal and Normal for your carb.

Gas running out of the hole at the bottom nipple of the float bowl means your float needle is leaking. Not staying running is most likely a plugged Slow "pilot" jet or plugged PMS pilot metering screw ports and passageways. When you use a finger to open the slide a little that is adding a little extra fuel from the third stage of the fuel delivery of the 3 circuits of that carb. First stage is the PMS and pilot jet, Third stage is the needle jet and slide, Forth stage is the main jet.

Your carb is dirty internally and needs a full disassembly and throughout cleaning inside. Make sure every port and passage way is clean. you may or may not need to replace the float needle too. Might just be a bit of crud caught in the seat prevent it from sealing when the float bowl is full. See Jetting 101 in the pinned section, it should help you out. Also... There are 100's of threads if not 1000's that deal with dirty carb cleaning, all are applicable and some offer good info. In a nut shell, pay close attention to how everything comes apart, Clean it well enough so you would not be afraid to eat your Wheaties out of it and re-assemble exactly the way it came apart.
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