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View Full Version : I Need Help 400ex Wont Start


sica
09-04-2003, 11:46 AM
I RECENTLY PUT A DMC ALIEN EXHAUST A K&N FILTER THERE ARE 3 1" HOLES IN THE TOP OF THE AIR BOX AND I HAVE A DYNOJET KIT WITH THE 155 MAIN JET AND THE E-CLIP ON THE 3RD POSITION ON THE NEEDLE.....I TURNED THE FUEL SCREW ALL THE WAY IN AND BACK OUT 3.5 TURNS AS THE INSTREUCTIONS SAID AND NOW I CANT GET THE DANG THING TO START....WELL IT WILL CRANK WITH THE CHOKE ON BUT WHEN I TAKE THE CHOKE OFF IT IMEDIATELY DIES.......AFTER TRYING TO CRANK IT FOR A FEW MIN. I TAKE THE SPARK PLUG OUT AND IT IS JET BLACK AND WET......WHAT DO I NEED TO DO???? DO I NEED TO TURN THE FUEL SCREW IN A LITTLE??????
F-16Guy
09-04-2003, 11:54 AM
Turn the fuel screw in one full turn (2 1/2), turn the choke OFF, and crank with the throttle held wide open until it starts.
stupid driver
09-04-2003, 12:24 PM
also, put a new plug in. u mighta fouled ur first one
sica
09-04-2003, 11:31 PM
i have gone through 3 plugs doing this......and the same thing happens everytime
Taco
09-05-2003, 12:53 AM
hrmm something doesnt sound right. Did you do the jetting and exhaust all at the same time?
09-05-2003, 01:06 AM
Using the choke on a 400ex is beggin for problems.. I think there called plug foulers not chokes....:ermm:
cals400ex
09-05-2003, 03:35 AM
most seem to disagree with me here, but the choke is how i can get my bike started. i think the key is not to keep hitting the throttle as your trying to start it because of the accelerator pump in the carb usually how i get it started is pump the throttle 2 or 3 times and then just hit the start button with the throttle fully closed. this is just for the winter, in the summer i don't need the choke.
sica
09-07-2003, 07:36 AM
i did all the mods at the same time..
F-16Guy
09-07-2003, 08:56 AM
Your bike sounds flooded. Holding the throttle wide open while cranking will clear it out, just don't "pump" the throttle.
Chanman420q
09-07-2003, 09:59 AM
make sure u push DOWN to take the choke off and u push UP to put the choke on. I had that problem....:eek:

i would up your pilot jet and down ur main jet Im running a Klein 155 with a slip on and no air box lid. I i believe the Dynos are bigger than kleins...?
sparks400
09-07-2003, 10:34 AM
Originally posted by Rico
Using the choke on a 400ex is beggin for problems.. I think there called plug foulers not chokes....:ermm:
wiht my choke all i do is turn it on until it cranks over then trur it right off, but it could be a jetting probel try what F-16 Guy said, get a new plug, and check for spark.