problems 400ex

bignickwaite · March 04, 2007, 12:06:23 AM

alright i just bought a 2004 400ex and its almost perfect.extreamly clean .the frame doesnt even have a scrach.it has 10 hrs on it .the problem is it wont idle and i can ride it but if i give it gas it boggs down and stalls .it has no work done to it .gas tank vent isnt cloged and tried to adjust the idle and that didnt work it runs real rough tell me what you think .if the carb needs to be cleand just try to instruct me on how to do so .thanks nick

Da_Mtg_Man · March 04, 2007, 12:44:35 AM

How old is the gas?
Check the spark plug. Possibly fouled.

CABLEGUY1 · March 04, 2007, 01:39:26 AM

Quote from: bignickwaite on March 04, 2007, 12:06:23 AM
alright i just bought a 2004 400ex and its almost perfect.extreamly clean .the frame doesnt even have a scrach.it has 10 hrs on it .the problem is it wont idle and i can ride it but if i give it gas it boggs down and stalls .it has no work done to it .gas tank vent isnt cloged and tried to adjust the idle and that didnt work it runs real rough tell me what you think .if the carb needs to be cleand just try to instruct me on how to do so .thanks nick

I bought my DS in like new condition with about the same amount of hours on it but it had been sitting about a year.It had the same symptoms as yours.I had Mike at ATP clean out the carb and it was fine however he said he had to soak the carb for a day just to break up all the sediment in it before he could clean it thouroughly.

eldiablo64 · March 04, 2007, 02:51:13 AM

my 300ex was doin that a couple weeks ago.I drained the tank ,cleaned the carb and adjusted the idle now it screams again

Fox17 · March 04, 2007, 02:58:17 AM

yea, the carb is "dirty" or clogged or whatever you want to say. we had a bike do that alot til we bought a fuel filter for it. its a 86 honda trx. the tank is real messed up so it gets like that. sounds the same. i dont know how to talk you through the process exactly but go check out exriders.com and ask them.

Ida_Mann · March 04, 2007, 01:54:53 PM

get yerself a can of carb cleaner from an auto parts store,,,,and then start tearing apart the carb,,,,,keep a cardboard box around to keep the pieces and don't worry if you have extra pieces once you put it back together.

or don't listen to me ;-)

Id@

dynodon · March 04, 2007, 02:11:20 PM

Quote from: Ida_Mann on March 04, 2007, 01:54:53 PM
get yerself a can of carb cleaner from an auto parts store,,,,and then start tearing apart the carb,,,,,keep a cardboard box around to keep the pieces and don't worry if you have extra pieces once you put it back together.

Leave it to you to give advice like that !!!!LOL

or don't listen to me ;-)

Id@

Ida_Mann · March 04, 2007, 03:01:56 PM

Quote from: dynodon on March 04, 2007, 02:11:20 PM
Quote from: Ida_Mann on March 04, 2007, 01:54:53 PM
get yerself a can of carb cleaner from an auto parts store,,,,and then start tearing apart the carb,,,,,keep a cardboard box around to keep the pieces and don't worry if you have extra pieces once you put it back together.

Leave it to you to give advice like that !!!!LOL

or don't listen to me ;-)

Id@

do you understand why I take my quads to ATP ;-)

Id@

IXIswamperIXI · March 05, 2007, 01:20:48 AM

My brother had the EXACT same problem... the bike only had a few hours on it... come to find out it was just the plug... the one that was in there from the factory was bad. Also you couldnt tell by looking at it. Didnt smell or look fouled but it was bad I think it had a short inside the plug.