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
MX4Life

Jetting With R&d Power Bowl?

4 posts in this topic

I just switched to blue after many years on a CRF450. I'm looking to clean up the bottom response on my new 07 YZ450F. I'm installing a R&D power bowl today and would like to address all the carb issues at once. All jetting and exhaust is stock. Fuel screw is 1 1/2 out. I race MX and all the tracks are at sea level. It's hot in the Northeast, 95 yesterday but most weekends are around 85-90. The R&D has the adjustable leak jet and a different spring for the AP instead of the oring fix. All advise is welcome as the Yamaha is new to me. Thanks...Doug

I tried the jetting forum without any luck.

Share this post


Link to post
Share on other sites

Doug I would pm Dean at R&D for advice and test results.

My thoughts on this is that the 07 is lean off the pilot and the mj and needs to be 1 step richer,but the R&D may need special jetting

Share this post


Link to post
Share on other sites

You might consider sending your carb for mods to Zip Ty Racing. I hear they run the Powerbowl on their race bikes now, and should be very familiar with the jetting needed. They also do some other tweaks to the carb, including a new billet AP setup. My carb is there right now!

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