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
juniorm123

? fuel screw

4 posts in this topic

just bought this 450,had a honda crf 250 is the fuel screw located in the same spot or round about area and by using the zip-ty fuel screw or tiny screwdriver,thanks never got a manual with bike was popping so figured lean try to make it a little richer also what are the stock turns out from lighly seated all the way in thanks

Share this post


Link to post
Share on other sites

The screw is located in the same spot. Tightening it in makes it leaner, and vice-versa. It should run well somewhere between 1 & 2 turns out. Worry first about how the bike runs, not whether the exhaust pops. If you think you have the adjustment right, and it still pops, you can try another quarter turn rich and see if that clears it up, and maybe another after that, but not much more, as you will end up with a too-rich idle if you go too far.

Exhaust backfire can also be caused by an air leak at the midpipe clamp, if you have one, or a slip joint in the same place, or a leak at the head, so check that if you have a persistant pop after you set the mixture right. This link may help:

http://www.thumperfaq.com/jetting.htm#PJ

:cry:

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