HEADS UP!!!

Site upgrade in progress... Core site functions are working, but some non-critical features/functions will be temporarily unavailable while we work to restore them over the next couple of weeks.

Please post any bugs you encounter, but before you do, check to see if it's already listed.

Thanks for your patience while we work to improve the community.

Sign in to follow this  
Followers 0
crf250r04

Bike pops when engine braking

8 posts in this topic

I have a 2009 yz450f that seems to backfire a lot more then it used to when the bike is engine braking.   I checked the exhaust for any leaks and couldn't find any ( is there a good way to do this).  Also I put a new piolot jet in the bike.  When the bike is in nuetral it very rarly will pop but once the bike is in gear and I let off the throttle and the engine braking kicks in it will start to pop a lot.  It is starting to get pretty annoying.  Any suggestions would be appreciated.

Share this post


Link to post
Share on other sites

Whether or not the pilot needs to be bigger can be determined by following the instructions in the second link I posted.

Share this post


Link to post
Share on other sites

Thanks, I will try the second link that grayracer posted.  Also I replaced the pilot with the same size. 

Share this post


Link to post
Share on other sites

Also what is a good way to check if the Hot start is closing all the way, I know if I pull it in the bike will idle higher, but is there any other way?

Share this post


Link to post
Share on other sites

Other than taking it apart and checking for free movement, and ensuring that it has free play at all times as you turn the bars, not that I can think of.

Share this post


Link to post
Share on other sites

i have an 07 450 that backfires / pops when engine braking. last time i had the carb off i had trouble getting the hot start installed properley. when i got it put back together the hot start didnt work. i could pull the lever and it didnt change the idle. it doesnt bother me because my bike starts easy most of the time anyways.besides popping alot it didnt change how it runs. could this be why it is popping / backfiring?

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

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0