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stic
10-20-2005, 06:26 PM
hey all...
i have an 03 400ex and was wonderin if anyone else has a problem keeping it running when the engines cold.itll start fine but ill have to keep on the throttle to keep it runnin.even with the choke.
are they all like this?
DH400EX
10-20-2005, 06:41 PM
yea all of them are cold natured.
03pissedoff426
10-20-2005, 06:43 PM
i agree, you usually have to gas em a bit till they awake
ommkevin
10-20-2005, 07:27 PM
yeah mine is like that too

is it bad to start it rev it high and then throw off the choke and ride
j_cyrus3
10-20-2005, 07:29 PM
probably not the smartest thing to do...make sure you let it idle and it gets warm, then ride the piss out of it
ommkevin
10-20-2005, 07:38 PM
every time i do that it bogs down and floods or sumthin


i have gone through 4 spark plugs since i got it
j_cyrus3
10-20-2005, 07:46 PM
maybe a little bit of throttle..not much...not much at all, just enough to keep it runnin.
freestylin400
10-21-2005, 01:54 AM
Ya dude, hondas are cold blooded! You just have to give it a little gas while its choked for about a minute or so and it will be fine.
tprender
10-21-2005, 05:49 AM
Go up 1 or 2 sizes on the pilot jet. This will help some of the cold starting problems. Try a 42 and work from there.
400EXBill
10-21-2005, 08:37 AM
Mine would do the same thing stock. It got worse after the FMF slip-on muffler. I backed the pilot screw out a 1/2 turn and it helped alot.
stic
10-21-2005, 02:44 PM
thanx for the input guys.the ex is completly stock.i could see if it had maybe some aftermarket pipe or something,but to leave the factory like this?
phildogg
10-21-2005, 05:33 PM
hey stic wassup bro its phildogg from gen3. I saw you got a ex I love mine. mine is alittle touchy when its cold nothing bad though..
phil
2004exrider
10-21-2005, 05:43 PM
every 400 is like that, the dealer even said they are harder than hell to start. Best thing i did to mine was a #42 pilot jet. Seriously, just pump the throttle a good 3 times and hold the throttle a l;ittle bit and start it. after that just keep the throttle feathered till it starts running good. You can still use the choke if you want, but its not necessarilly needed.

Jimmy
stic
10-21-2005, 06:18 PM
after that just keep the throttle feathered till it starts running good.
thats what i do now.it starts right up but wont stay runnin'.
a size up pilot will help this?
i took it out today and it started right up,i used the throttle to raise the rpms a hair and left it there for a min and it was fine.
guess thats gonna be the norm from now on,eh?
like phildogg said...its nothing bad.ill get used to it.small price to pay for the amount of fun
:D
thanx for the input
AtvMxRider
10-21-2005, 06:19 PM
Originally posted by DH400EX
yea all of them are cold natured.
ReconRider25
10-21-2005, 07:34 PM
my 400 has to run a good 15-20 minutes before it will idle by itself on half choke....just learn to be patient.....