my 400ex will not start please help me !

[FreeStylerEx]

i have a 416exwith about 17 hours on the rebulid..well today i was jumping a 6 foot high jump and landing perfect and all..well then after the jump i went into a berm in 3rd or 4th gear...well comming out my rear tire and rim clipped a tree sumhow.well it didnt jerk me or nuthin just tapped it and i was still going..then about 7 feet from the tree my bike just bogged down and turned off.....and it wont start..pissing me off..could it messed up the starter or sumthing sum how?...fuse is fine..new spark plug..110 gas and ****..my bike is fully modded...and im dieing to go riding friday or saturday...bike just wont turn over period..all wires seem to be connected together rite tho

[JDiablo]

is the battery charged?
If not then the only thing i can think of is when you hit the tree that you probably made a connection come lose somewhere,i would say check all wires first

[JOEX]

Yeah, sounds electrical. One thing that is common i a loose wire on the relay, I think that's where it is.

If you still have the neutral light installed does it light up when in neutral and the key is on?

[400exrider0004]

check battery cables and battery itself. Make sure you are in neutral. Hope you can fix it!

[Dannys440]

Mine did(and still does) this some times. Does it start when you push it down a hill and dump the clutch? Try cleaning the battery terminals, and where the ground hooks to the frame.

[FreeStylerEx]

WELL YEAH !..i checked all wires and the neautral light cmes on when turned on.....its really pissing me off....i installed my new orange plastics last night and she just wont start..it makes the noise when you hit the button but wot turn over

[JDiablo]

if it is a buzzing noise that sounds like its coming from the start relay then your battery is dead bro,just charge it up for a couple of hours and you should be good and ready to roll again

[FreeStylerEx]

no no..battery is full...it makes the winding noise like it makes when your trying to start it when its flooded but its not flooded....i hooked it up to my truck to jump it off..wont work....very iritated

[Buffalo400]

try to bypass selonoid..

[yamablaster24]

get a new spark plug.

[FreeStylerEx]

spark plug is new....just been outside and i took the plug out by the way..and put it in the plug cap and try to start it and no shock/ spark goes threw the plug ? any ideas?

[Norris3710]

Try pulling out the spark plug and then try to start the bike with the spark plug out to see if it turns over!!

[FreeStylerEx]

does not turn over..could it be the starter?

[crazyatvn]

Originally posted by Buffalo400
try to bypass selonoid..

what he said

[markk]

Pull your starter motor off, and see if u can turn it over by hand, Also, start at your Primary side of your electrical harness, and check eveything over then move onto your secondary side,,

(primary everything 12v) (secondary everything that makes spark)


Also 400EX's have some problems with the electronic rectifier coming upluged, Pull the plug out and clean all the termananles in there, and Also be sure to check ALL your conections.


SOunds to me like u have a bad ground possible.

[Dannys440]

Check your starter coil.On both side to see if it is getting power and if it is sending out power.

[itlnstln]

Do you have an aftermarket kill switch on it, cause those things go bad all the time!

[FreeStylerEx]

how do i check the sark plug cap to see if its sending spark ?

[Dannys440]

I know how to do it the hard way, but I wouldnt reccomend it.
This is the easy way:

Take your spark plug out put it in the plugcap,I hold it to the frame(some hold it to the motor) and push the start button, if it is sending power there will be a visible spark.If not try it with a different plug then if it dont work try taking a buddies 400ex starter coil off hook it to your and try it then if it works there is your problem.The starter coil is located under the gas valve.