wr 400 idle wont adjust down


6 replies to this topic
  • bozi

Posted December 03, 2014 - 12:47 PM

#1

i have a wr 400 1999 that i have recentley rebuilt with new piston and valves, it has a dep 7 exhaust on it that is the only mod on it. The problem i am having is that i can start it without any choke on and no matter what i do with the fuel screw it makes no difference to the idle ihave gone from a stock 45 pilotjet to a 48 no change and to a 42 and 40 still no change i have sprayed wd 40 all over to check for air leaks but no joy in finding one . I have stripped the carb and checked the slide plate no cracks in it. the header pipe glows red as its revving high about 3000 to 4000 revs the only way i can slow it down is to pull the choke out half way and the header stops glowing but if i pull it right out it revs and if it goes all the way in it revs any he would be a great help

 



  • Krannie McKranface

Posted December 03, 2014 - 01:28 PM

#2

Does it have a hot start



  • bozi

Posted December 03, 2014 - 01:45 PM

#3

Yes it does have a hot start on the handle bars

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  • Krannie McKranface

Posted December 03, 2014 - 02:45 PM

#4

You probably need to service the hot start: cracked cover, leaking plunger, corroded cable holding the plunger open, etc



  • bozi

Posted December 03, 2014 - 02:47 PM

#5

I will disconnect it tomorrow and try it with out any on

  • Krannie McKranface

Posted December 03, 2014 - 03:33 PM

#6

I will disconnect it tomorrow and try it with out any on

 

Uh, that is not going to work. Won't change anything.

You have to service the components on the carb.



  • jackfly

Posted December 03, 2014 - 09:27 PM

#7

Do yourself a favor and order an aluminium cap from Amazon. The plastic one can be a pain....




 
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