Help Plaese


17 replies to this topic
  • Nathaniel2010

Posted March 24, 2009 - 11:20 PM

#1

ok i rebuilt my carbe put it back together bike started all good but while idling it runs fast then slow and very fast after i rev it or the revs die down nd it stalls while at idle the fuel line was leaking a bit so i'm fixing that now would that cause this or is there a real problem?
Thx for havin a look all advice will be much apreciated

  • schrode

Posted March 24, 2009 - 11:30 PM

#2

leaking fuel can't be helping the situation. fix that first. is the throttle operating smoothly, no hangups? maybe check for vacuum leaks

  • grayracer513

Posted March 25, 2009 - 06:13 AM

#3

Have you adjusted the idle mixture since you put the carb back together?

  • spark250

Posted March 25, 2009 - 09:31 AM

#4

Definitely try and adjust/fix the items mentioned previously first.

Is it like pulsing with the idle, or would you describe it as a "hanging" idle?

The idle on my bike used to stay high after I reved it and very gradually come down. It was pretty all over the place.

I had to readjust the TPS. Could be something to check?

  • grayracer513

Posted March 25, 2009 - 09:44 AM

#5

If you removed the TPS, you WILL have to readjust it back to spec per the manual.

  • Nathaniel2010

Posted March 26, 2009 - 12:47 AM

#6

thx guys fixed the fuel leak still did it, so checked and ajusted the TPS and it's all working now thanks for all the help u guys rock

  • Burrap

Posted March 26, 2009 - 07:05 AM

#7

what is tps? the pilot screw maybe

  • grayracer513

Posted March 26, 2009 - 07:59 AM

#8

Throttle Position Sensor; the electrical device on the left side of the carburetor.

  • spark250

Posted March 26, 2009 - 08:20 AM

#9

Glad it worked out! TPS on a dirt bike was definitely a "new to me" thing when I moved to a 4 stroke.

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  • Burrap

Posted March 26, 2009 - 09:03 AM

#10

mine does the same thing and i dont have a manual, does anyone know how to adjust this to spec for an 01' 426?

  • grayracer513

Posted March 26, 2009 - 09:20 AM

#11

i dont have a manual,


Now you do:

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

  • Nathaniel2010

Posted March 26, 2009 - 11:10 PM

#12

you can get eh manual from here(http://motoman393.th...426_manual.html) it's not in pdf format but still very helpful can be printed so u've basically got ur own book :thumbsup:

  • Burrap

Posted March 27, 2009 - 06:10 AM

#13

thanks a lot

  • grayracer513

Posted March 27, 2009 - 06:26 AM

#14

The manuals I linked to are also printable.

  • spark250

Posted March 27, 2009 - 06:37 AM

#15

Motoman's site can be helpful but the link gray gives is for the factory service manual. You can't beat those!!!!

  • Burrap

Posted March 27, 2009 - 06:52 AM

#16

im still unclear on what needs to be adjusted or replaced. do i just clean up the wires? Please Help

  • grayracer513

Posted March 27, 2009 - 08:07 AM

#17

Download the manual and go to page 6-7. The tests begin on 6-8, and the adjustment is on 6-10.

  • Maxed-out

Posted March 29, 2009 - 05:48 AM

#18

HAHA my bike has his same ishew, it takes a while to idle down, but noe to long, enough to piss you off. Any way i was reading my manual on how to adjust the TPS and what a prosses that is! I dont want to even do it!

Now is the TPS very sensitive? To adjust it says to slightly move that unit up or down and align those slots up? I dont know when you start getting electrical involved with fuel im lost after that.:thumbsup:





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