Idle impaired WR400 !!! Help wanted !!



No replies to this topic
  • Alain

Posted April 26, 2002 - 05:43 AM

#1

Ok guys here is my story.... My bike is not idleling anymore since I`ve changed by stock pipe/header for a WB Hi-boy Header and pro-meg shorty(8 discs) and I have gone to YZ timing. Before doing these modifications the bike was ideling perfectly. Prior to the modifications the jetting was stock and.... all remained stock except for my main jet which I brought up to 172 (from 168) but that won`t change anything as fas as idleling is concerned.

I read a recent post on a bike that didn`t idle or hard to start and in there they mentioned that this problem could be caused by the throttle slide plate being upside down... I checked it last night and I had installed it correctly. My pilot screw is set at ~ 1.25 - 1.5 turns out and when I turn it out more the mixture is rich and there is an untolerable bog with black smoke so I`m figuring that I`m ok as far as the pilot cct but I could be wrong. I`ve also tried to fidle around with the idle screw but to no avail.....

So far I haven`t really done a test ride I`ve only tested on the bench... should I go out and ride it for 1/2 an hr to make sure it`s all warmed up and then chk the idleling ?? Aside from idleling, when I went through the throttle range it felt crisp and good thorughout the range. Another thing I noticed is that when I manually hold the choke 1/4 to 1/2 open it seems to be better.... Maybe I though that I brought the motor to operating temperature but I didn`t....

Any advise will be greatly appreciated.

thanks guys.

Alain





Related Content

Forums
Photo

Megabomb Fitment by 288yz450


Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • 1 reply
Forums
Photo

YZ450FX OR YZ450F by MESSMAKER


Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • Hot  30 replies
Forums
Photo

Should I buy this bike? help....... by Numsa Hul


Dirt Bike   General Dirt Bike Forums   What bike should I buy?
  • * * * * *
  • 10 replies
Forums
Photo
Supercross

Wilson the Blue Privateer by jetfuel


Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  50 replies
Forums
Photo

05 yz450f not fast enough by RedeyeYZ


Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • Hot  38 replies
 
x

Join Our Community!

Even if you don't want to post, registered members get access to tools that make finding & following the good stuff easier.

If you enjoyed reading about "" here in the ThumperTalk archive, you'll LOVE our community. Come join ThumperTalk today!

The views and opinions expressed on this page are strictly those of the author, and have not been reviewed or approved by ThumperTalk.