Jump to content
Sign in to follow this  

06 wr450 backfire problems

Recommended Posts

I recently bought an 06 wr450f and it has a hmf slip on exhaust installed. The bike backfires sometimes. Is this a big issue? I'm buying a quiet core and spark arrestor insert for the muffler. What exactly should I be rejetting on the carb, if anything at all? Thanks

Share this post


Link to post
Share on other sites

You need to give us a little more information then that like...elevation. Be a good idea to go through the entire carb to see what you got in there. Backfire is your lean on the fuel screw. You might need to open it up a 1/4 or 1/2 turn. You also could be lean everywhere else like pilot jet.

Share this post


Link to post
Share on other sites

You have a lean condition caused by an air leak.

 

No reason to change jetting if it ran well before with the jetting you have, unless you went up 8,000 ft......

 

 

Fuel screw

Muffler joints

Air boots

 

EDIT

 

..corroded and leaking hot start plunger <<<<< very common

Edited by KRANNIE

Share this post


Link to post
Share on other sites

Also check to make sure the little rubber boot on hot start nut is properly seated.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Reply with:

Sign in to follow this  

×