2000 wr 400 spudders at low rpms


16 replies to this topic
  • ryankx450

Posted December 20, 2010 - 09:35 AM

#1

It starts good it pulls good but when im crusing at low rpms it spudders like ba baba ba baba ba baba but if i hit the gas it pulls hard and runs good wt........?where should i start? thanks

  • William1

Posted December 20, 2010 - 01:05 PM

#2

Has it always done this or is it a new issue?

Did you try unplugging (not unscrewing and removing) the TPS?

  • ryankx450

Posted December 20, 2010 - 01:25 PM

#3

Not sure i just got it this weekend and whats the tps

  • William1

Posted December 20, 2010 - 01:44 PM

#4

Ah, I see. TPS = Throttle Position Sensor

You need to spend a few hours and read the owners manual and get familiar with your bike before you try to repair it. After you have read the book a few times and know what is what on the bike, unplug the TPS like I suggested and test ride. Get back to us with what you find out.

If you do not have a manual, it can be D/L from Yamaha Here.

  • ryankx450

Posted December 20, 2010 - 02:14 PM

#5

Thanks I will do some reading tonight and get back to you thanks

  • Shred Jesse

Posted December 21, 2010 - 11:40 PM

#6

There's a TPS on the WR400???

Wha??? Why? It's not even fuel injected?!?!?

  • DSM_Tambo

Posted December 22, 2010 - 07:05 AM

#7

Yes, there's a TPS. It's the only sensor we have.

Posted Image

It detects the throttle valve opening and sends a signal to the computer inside the CDI. "The microcomputer in the CDI unit detects the engine speed and throttle position, thus determining the optimum ignition timing through the entire operating range. In this way, quick throttle response can be achieved according to various riding conditions." (taken from service manual)

  • ryankx450

Posted December 22, 2010 - 07:10 PM

#8

I took off the TPS and it still studders maybe a little less.....What next?????

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  • mikewrf18

Posted December 23, 2010 - 01:23 AM

#9

I took off the TPS and it still studders maybe a little less.....What next?????

I hope you didn't remove the TPS.?? You just have to unplug the wire connector going to the TPS. If you completely remove the TPS, you run the chance of loosing power and performance even if it is reinstalled. At least that is what the manual says. Can you clarify?
It would also help to know what mods have been completed, and your jetting settings, if you know them.

  • William1

Posted December 23, 2010 - 07:58 AM

#10

If the bike is definitely better with the TPS disconnected (not removed) then that may be part of your problem. Dig out your manual and go through the tests in it. Hopefully, it just needs a small adjustment. Once that is done, re-connect it and confirm the bike is even better now. Let us know.

  • ryankx450

Posted December 23, 2010 - 08:14 AM

#11

Yes just diconnected it not removed

  • 96sp00wr

Posted December 23, 2010 - 09:24 AM

#12

Did you pull and clean your jets? My 2000 is extremely sensitive to even the slightest obstruction in the pilot jet and it can happen fast on modern gas.

  • ryankx450

Posted December 23, 2010 - 11:02 AM

#13

Not yet but i will this weekend thanks any other problems with the 2000? Does the header pipe at the motor suposed to get red hot when you worm it up?

  • 96sp00wr

Posted December 23, 2010 - 11:25 AM

#14

I guess the header will glow if you leave it sitting but it doesn't need to idle for very long. I am not sure about the TPS when your carb is most likely a gummed up mess. Clean or replace all the jets if you don't know how to ream them out, new plug and clean air filter properly will be a good start.

  • ryankx450

Posted December 23, 2010 - 11:49 AM

#15

Thanks Ill let you know how it works

  • travertt

Posted December 23, 2010 - 01:31 PM

#16

Not yet but i will this weekend thanks any other problems with the 2000? Does the header pipe at the motor suposed to get red hot when you worm it up?


Yes...the pipe will glow red when the bike is idling. This is absolutly normal on the WR..do not worry about it....or avoid looking at it. Either way the result is the same...no problem!

  • ryankx450

Posted December 24, 2010 - 12:41 PM

#17

I forgot to sa it has a daja kit on it and the guy said he changed the cam setting to the yz setting not sure what that means...

Thanks for the pipe info.....

I pulled the carb cleaned the jets- Cleand up the spark plug- cleaned the filter- made sure the fuel line was clear- I tried the stock baffle the after market baffle and no baffle and it still has the same problem...........What next




 
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