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
ducatiwv

07 WR450 jetting again

3 posts in this topic

I converted my WR to a motard over the winter and just have started riding it. I had trouble with the low speed jetting , but got that pretty muched fixed with a new leak jet and the fuel screw. I also installed the JD jet kit with red needle in 4th position. I ve also searched this forum and havent found any fixes for the mid range stutter and bog problem i have. Its usually from about 1/4-3/4 throttle and happens during a steady throttle application. If i gas it hard or fast , it only stutters some. If i give apply the throttle slowly , It really stutters BAD. I ve also unplugged and plugged back in the TPS with no positive results. Anyone have any new suggestions for this problem , since it seems to be one that is common with alot of the WR's....thanks, Larry

Share this post


Link to post
Share on other sites

That problem makes me wonder if your JD needle was mis-marked because what you describe sounds like a rich needle condition.......which happens frequently with the blue needle.

Share this post


Link to post
Share on other sites

my bet is the pilot jet is a size too big. making the whole band just a bit fat . I have a 07 wr450 motard . And mine only stutters at about 1/4 throttle just holding it there . if I roll into the throttle or crack on it just goes no bog or shutter. I jetted my bike on a dyno with a wide band o2 sensor, and was surprised to find that the stock pj was fat and my accel pump was not working at all. so I jetted it down one size to a 42 and put on a rd powerbowl with the needle 1/2 turn out.

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