99 yz400f issues


6 replies to this topic
  • brandonxwestbrook

Posted February 25, 2009 - 07:55 PM

#1

My buddy's got a '99 yz400f that wont stop dripping gas. the float bowl was stuck and we took the bottom of the bowl off and unstuck it, re-assembled and now it just pours out of the overflow. any ideas of whats wrong?

  • DRZ04

Posted February 25, 2009 - 08:41 PM

#2

You really need to know something about a carb before you pull it apart & unstick the bowl. Take a look at these so you can get an idea of what is inside. http://www.sudco.com/keihin.html#FCR / http://www.yamahaown...ook.com.au/?r=0
Research is what you need to do.

  • grayracer513

Posted February 25, 2009 - 10:07 PM

#3

My buddy's got a '99 yz400f that wont stop dripping gas. the float bowl was stuck and we took the bottom of the bowl off and unstuck it, re-assembled and now it just pours out of the overflow. any ideas of whats wrong?

I assume you mean the float was stuck. Either way, you still have a problem with the float and needle assembly.

For service manuals, I prefer the European link over the Australian one, because the manuals you can download there are printable for the most part, whereas the others aren't.

http://www.yamaha-mo...ice/manuals.jsp

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  • brandonxwestbrook

Posted February 26, 2009 - 08:23 AM

#4

yes I did mean the float. sorry. I know enough to rebuild and rejet and clean them but as far as tuning I have no clue.

  • DrThumper

Posted February 26, 2009 - 01:33 PM

#5

Sounds like you need to replace the float needle. It has a rubber tip on it, sometimes that will deteriorate over time, depending on what type of gas you use. I used to race a lot in Mexico, there gas ruins that little rubber tip.

  • FinchFan194

Posted February 26, 2009 - 02:55 PM

#6

Sounds like you need to replace the float needle. It has a rubber tip on it, sometimes that will deteriorate over time, depending on what type of gas you use. I used to race a lot in Mexico, there gas ruins that little rubber tip.


I love and I mean LOVE your avatar!

  • yz400fsmasher

Posted February 27, 2009 - 08:32 AM

#7

your floats can be out of adjustment.





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