problom with 04 z400

[kennyp87]

i have a 04 z400 se and 1 day i was ridin it it seemed like it ran out of gas so i filled it up and it wouldn't start,me and my brother took the carb off and cleaned it put it back on and it ran like crap,so we took the carb back off and changed the jets and it did the same thing,i bought a used cdi box just to see if that was the problom,it ran for about 2 hours and did the same thing,now it will run but it cuts out and won't idle,can anyone help me?

[erbilabuc]

same thing happened to me with same problems and it was the previous owner set the idle so low that it would only run when the choke was on and it would bog all over the place. Check your idle adjustment.

[kennyp87]

i tried and it still won't stay idlein,after it runs for like 10min of constantly hittin the throttle it dies and won't start

[kennyp87]

and when it runs theres no loud motor noice

[jonboy]

Sounds like your valves clearances are out. Get a manual and check you tolerances. It more than likely needs to be reshimmed this is a very common problem on the Z

[kennyp87]

i had it runnin today and it was idelin up and down it wasn't a steady idle and when i gave it gas it would die out so i had to keep feathering it, when i gave it full throttle it would die out

[kawiracerj]

valves!!!!!!!!!!!!!!!

[kennyp87]

would it still be them even if there is no noice comin from the motor

[jonboy]

Yep I'll bet they are too tight not letting the motor breath. Without proper flow thru the head its not going to pull the fuel and air thru to let it run.

[kennyp87]

me and my brother took it apart and we checked the vavles and they are in spec,i ordered a brand new cdi box and if that don't fix it i am clueless

[400ex_rider13]

disconnect your voltage regulator or the 3 wire connector at the stator, than try it.

[johnafun]

i had same prob . turned out had water in gas .befor you spend any more money at least try draining your fuel tank , float bowl , make sure your air box is dry and clean air filter make sure your float valve and area is clean and moves freely. and make sure your CDI box conection is clean and not ceroded. these all the things that were done to clear up my prob

[kennyp87]

thank u guys for atleast tryin to help me,i put a high rev cdi box on it and it ran the same,so we said somethings gotta be messed up with the carb cuz everything else was workin,we tore the carb apart come to find out the lower jets were plugged

[johnafun]

hip hip huray !! at least you didnt have to send it into the shop ... hey a product called seafoam or stable put into the tank every so often or keeping float bowl and fuel tank drained if sitting for more then a month might help prevent that from happening again

[400ex_rider13]

Hey, glad to hear you found your problem,but don't forget that most of the debris that gets into carbs. is through the carb. vent.So make your vent hose is in good shape, routed properly and clean.
Cheers.