05 Yzf 450

1 reply to this topic
  • 4chevys4me

Posted July 24, 2006 - 04:41 PM


I need some help. This is for my friends bike. Bike has always run a little rough. Popps on deceleration and just seems off. How is the jetting on these bikes from the factory( lean/Rich )? He only uses it for trail riding and has had it 2 years now. When we tried to go out Sunday he only made it about 1/4 mile. Popping and spitting till it just died. It tried to fire once after that, but nothing. Plug looked like it may be a little lean. Could it be time for a top end? I have no idea how finiky these bikes are. Any help would be great.
Thank You

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • Zique

Posted July 24, 2006 - 05:30 PM


Jetting from factory is lean, but it should run more than 1/4 mile. Did he buy this brand new? Popping on decel usually is a good hint of lean jetting as well. A new top-end would be a pretty extreme circumstance and it shouldn't need anything like that for quite a while.

Related Content


Yamaha YZ450F 2017 by Chris.GVS

Yamaha YZ450F 2017
  • - - - - -
  • 0 reviews

yz250x vs 450 4t comparisons (preferably desert riding) needed by JakeNorthrupYZ450F

Dirt Bike   Make / Model Specific   Yamaha   Yamaha 2-Stroke
  • 9 replies

Snake pit oct 30th by The Anvil

Dirt Bike   Dirt Bike Regional Discussion   California
  • Hot  293 replies

The "going back to the other darkside" adventure... by Monk

Dirt Bike   Make / Model Specific   KTM   250/350/450/505 SX-F & XC-F (4-Strokes)
  • Hot  94 replies

James Stewart back on a YZ450F by YamaLink

Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  47 replies

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.