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
Trail-Seeker

FMF Q troubles

5 posts in this topic

Hi guys, newbie here, to both jetting & forums. I'v got an 03 wr 450 recently rejetted to 160 main, 48 pilot, 70 starter. Grey wire cut, throttle stop shortened, snorkle removed, needle clip stock position, stock pipe baffle out. After all these changes bike ran better than ever. Yesterday installed FMF Q and the problems started, hard to start, back firing with flames out the pipe and surging at steady throttle position. I'm in Dallas area elevation around 700 feet. Can anyone send me in the right direction or should I go back to stock pipe. thanks

Share this post


Link to post
Share on other sites

Sounds far too lean to me. Are you still running the stock needle? Try running a larger main jet, probably a 170 and fixing the needle. Also, dont forget to adjust your fuel screw.

My settings are as follows-2500 to 4000 feet alt.

172 main

48 pilot

JD blue 4th clip from top

fuel screw about 1.5 turns out

The remaining jets are stock.

Just hauls with this setup.

Good luck and be patient when jetting. It ca be a real pain if you let it get to you.

:)

Share this post


Link to post
Share on other sites

you might want to check the pilot jet for clogging,if you have the correct short screwdriver bit you can remove it by just removing the float bowl drain cap 17mm wrench,i've had to do mine a couple of times,baja gas is not filtered and the fine stuff takes it's toll,:)

Share this post


Link to post
Share on other sites

I put a Q on my 04 when I had it and it did the same thing. Start by opening up the fuel screw. If that doesnt help, put a fatter pilot jet and it will cure your problems.

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