z400 stuck in reverse rev limiter?

[gsxrkneedragger]

i posted a few days ago about my quad going slow it ran fine but when i gave it gas, it would almost miss. i tore the carb apart, like someone said and changed the plug, and its still doing it. my buddy was looking at it yesterday and said that it sounded like the motor was hitting the rev limiter in reverse, but when i was really in foward gears. i can go through all the gears but get the same problem at a certain rpm. anyone know what the heck i am talking about? and know how to help? thanks in advance. this sucks. haha

[cataway]

did you by chance take the air box lid off and not rejet ?

[airmobile101]

Sounds like your cdi box might be heading south for the winter.

[gsxrkneedragger]

i tried taking the lid off, and then even the filter out for a min to see if it was the jetting. it still did it. it used to run great until all of a sudden it started doing that.

[kellymi]

Does it miss at all RPM's or in just a certain area? When it misses does it backfire?

[gsxrkneedragger]

when it gets to a certain rpm, like1/4 to 1/2 throttle, it starts doing whatever it is doing. it does in a way sound like it is bouncing off the limiter, but it also sorta sounds like it is missing. i know, i'm not too good of help. i haven't heard it hit the limiter in rev for a while. and no, it doesn't backfire at all.

[k4f5x0r]

clean the carb. friend had a similar issue and the carb was dirty and clogged the ejts. do that first.

[gsxrkneedragger]

i tore it all apart the other day and cleaned it out real good. still was doing it and sounding the same. maybe i missed something?

[miles Machine]

i believe the newer z's have a tps so check your throttle cable free play it might be setting or the tors.

[gsxrkneedragger]

mines an 03 and it doesn't have a tps. whats a tors? i'm new to the quad thing, so sorry.

[airmobile101]

Try it in reverse and let us know. Im usually wrong 99.0 % of the time, but that 1% represents !!!!!! 2003 does not have the TPS/TORS on it,so we can eliminate that idea. I still think the CDI box has an issue,but the carb can still be an issue also. I would break that carb back down and soak it in Seafoam for a few days and try again.

[gsxrkneedragger]

i tore the carb apart again and cleaned it very good with cleaner and air. put it back together, did the same thing. i was just messing around and found then if i rev it up in neutral some, and then shirft into first and dump the clutch, it goes until it hits the rev limiter, but as soon as i even just slightly let off the gas, it starts doing what its been doing the whole time. now what?

[kellymi]

Check your valves. I guess it could be your CDI, Find another one to throw on there and see.

[gsxrkneedragger]

would one from an 06 dvx400 work? other than that, i'd have to buy one. i don't know too many ppl that ride. i might be able to go to a dealer i got connections with and see if i can steal one off of one in the shop.

[airmobile101]

Naw, sorry. an 06 cdi won't work on an 03.

[gsxrkneedragger]

i figured it out and fixed it. runs great now. it was 3 of the 4 wires from the gear position switch were cut. i'm guessing from my chain somehow. but i soldered them together and runs great. thanks for the help.

[airmobile101]

Good stuff, Im gonna have to remember that one !

[gsxrkneedragger]

i had 3 ppl look at it, called 2 shops, took it to one of them, neither coulg figure it out iwth a manual, just happen to see a small slice in the black wrap stuff and then exposed the wires. and bingo. it was so frustrating :grr:

[yfzrider310]

could you describe were this black wrap stuff is. My buddy was having the same problem. Or maybe post a picture.

[gsxrkneedragger]

its basically like shrink wrap but not compressed all the way. this is the gear switch, and out of it there are 4 wires that go into this tubing stuff

[gsxrkneedragger]

the wires, about 4 or so inches from the end of that switch, were the ones cut. look for any type of small tear in the tubing. i just soldered them together and shrink taped each one and then wrapped in in electrical tape real good.

[gsxrkneedragger]

hope this helps. good luck with the problem. if you need anymore help, ask. btw, i know i'm missing a bolt in my sprocket, its there just sheared off and my chain is pretty bad. they are both getting replaced next week. hopefully.:ermm:

[yfzrider310]

Thanks for the help I am going over there tomorrow and I will let you know if that is the problem.

[ifixtheyride]

yeah I posted couple months back for that stupid switch I spent a whole weekend changing jets and all just happened to coinside with a big bore change and I thought that was the problem mine needed removed and the copper pads inside cleaned its the dumbest switch I ever seen. Good find though.

[718 kaw]

How would you bypass the switch? what wires would you have to splice together. My wires are torn clear out of the switch.

[ifixtheyride]

honestly I don't know I was going to try that also there are 3 wires they go to the spark control module my digrams don't go into enough detail. The switch is like $50 bucks. It's just a stainless ball and spring that turns with the gear shift and completes a path you would think just tie 2 wires together but there are 3. It's a ridiculas design it coupled to the gears inside of the motor it would have been easier to do some other way but so much for engineers that don't work on ****.