Need Carb help on 2003 YZ450

1 reply to this topic
  • writebrian

Posted January 01, 2013 - 04:16 PM


The carb on my buddies bike has been acting weird lately. Periodically it just free flows fuel from tank out of hoses to the ground when you turn the fuel on. Is there some way the bowl can get stuck open perhaps? Also doesn't idle well. Will go from high rev to normal idle without any help from rider. Much popping on deceleration (which I believe is a carb issue too).

What should I be looking for? Any links to a removal and 'rebuild' of the carb on this bike? It can't be that hard... right? Any help appreciated.

Edited by writebrian, January 01, 2013 - 04:19 PM.

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • grayracer513

Posted January 02, 2013 - 12:40 PM


Sounds like you should look for a bunch of dirt. All it takes is a tiny speck of grit on the float needle to hold it open. Popping and stumbling could be a pilot jet with a varnish deposit. You'll never be able to see that, though, so read this:


Related Content


Michigan Motocross Tires by 288yz450

Dirt Bike   Dirt Bike Regional Discussion   North
  • 1 reply

yz400f throttle bog by yz400fmaniac

Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • * * * * *
  • Hot  28 replies

First Hare scramble tips by dhend8

Dirt Bike   General Dirt Bike Forums   General Dirt Bike Discussion
  • Hot  33 replies

100 hrs on 2014 yz450f, shim valves or replace them? by ttr230rider6

Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • Hot  79 replies

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

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