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400exmatt
08-01-2006, 11:50 PM
I have a 400ex and i was riding it the other day, and it was running fine and all of a sudden when i hit the throttle, it had no power at all. I just had it rebuilt a few months ago. I checked to see if it was the cdi, but that wasn't it. Any help would be greatly appreciated. thanx
79400ex
08-02-2006, 12:08 AM
Is it smoking? Does it still run? If it still run I wouild check the vent on the gas tank if you been riing in the mud. It might be plug it will cause it to strave for fuel. I would try this. IT is a easy check.
firefighterjosh
08-02-2006, 02:25 AM
Is there fuel in the tank? or is your gas on?
400exmatt
08-02-2006, 02:15 PM
it doesnt smoke or anything, has plenty of gas and yes it was on. i just changed the plug and that didnt seem to help. Do u think it might be my carb?
400exmatt
08-02-2006, 02:24 PM
ttt
initall
08-02-2006, 02:41 PM
is the choke on?

i forgot to tunr it off once and it kept falling on its face when i gave it gas
Ralph
08-02-2006, 03:00 PM
could have some dirt in your jets. Also, sometimes it looks like you have plenty of gas but its the reserve. Turn the nob to reserve and it might be fine...
TRX_450
08-02-2006, 03:00 PM
Originally posted by initall
is the choke on?

i forgot to tunr it off once and it kept falling on its face when i gave it gas

ye check that...check your killswitch, check your air filter. mine did that in the snow and it ended up being a frozen filter..but who knows, check your carb, and also like they said check the vent hose
400exmatt
08-06-2006, 04:31 PM
still cant find the prob
MOFO
08-06-2006, 04:40 PM
Next time post it in the correct forum.

Have you checked your main jet? Does it idle ok and only run like crap ofter you give it gas? From the little bit of information you have provided makes it sound like a main jet has fallen out...
twiggz
08-06-2006, 09:24 PM
your carb is dirty. mostly yur main jet. carbs are easy to clean. jsut make sure you flush the hole carb out good so you arent jsut moving the dirt around. take the jets out and spray through them.
400exmatt
08-07-2006, 07:24 AM
ya i was thinking that my jet might have fallen out. well ima take the carb off and check today, thanx
Wheelie
08-07-2006, 08:40 AM
Check the screws in the slide valve in the carb. Move the throttle and make sure everything is operating properly.
400exmatt
08-09-2006, 04:01 AM
i found and fixed the problem, my needle came loose in my carb. but now its fixed and running fine. thanx ppl