3 replies to this topic
  • DelTronXR

Posted December 09, 2004 - 07:03 PM


I've got a 2003 BRP and when it's not warmed up all the way, it backfires, and it even does it after warmup (just not as much/dramatic) on the throttle braking. I've got a 172 and a 68, an applied smog block off, pro-circuit head pipe and silencer, hrc manifold, and a Uni filter. Why the hell does it pop so much? You'd think I was running 110 octane Turbo Blue or something that was exploding out of the bike's butt! :cry:

  • qadsan

Posted December 09, 2004 - 09:11 PM


Try adjusting the fuel screw per the service manual or see this link for more info. It's free to try and it might help.

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • XR6's_rule

Posted December 09, 2004 - 09:35 PM


Sounds like you've got an exhaust leak, check the tightness of the clamp where the header joins to the muffler and where the headers join to the cylinder head, while you're down there, check for black soot stains around the joins-sure signs of the joint leaking, which causes backfire. Failing that, give everything a good clean in the carby and make sure the airscrew is set correctly. Good luck! :cry:

  • frankstr

Posted December 10, 2004 - 05:19 AM


Hows the valve adjustment,a tight valve lash will make it backfire :cry:

Related Content

Want to add a kickstart to your XR650L?  Here's how - last post by clc3251

Want to add a kickstart to your XR650L? Here's how

  • 1 reply

XR650L super moto wheels by greggkklee

Dirt Bike   Make / Model Specific   Honda   XR600/650
  • Hot  29 replies

Post Apocalypse, ThumperTalk style! by Justin Pearson

Dirt Bike   General Dirt Bike Forums   General Dirt Bike Discussion
  • Hot  35 replies

93 xr650l Restoration Project by Zigster

Dirt Bike   Make / Model Specific   Honda   XR600/650
  • 17 replies

Fell Off Trailer by usafxr

Dirt Bike   Make / Model Specific   Honda   XR600/650
  • Hot  43 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.