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

YZ250F Jetting that works(it starts)!!

1 post in this topic

Over the last few weeks I've seen posts relating to the YZ250F and it's starting pblms. I think that I may have figured this

beast out. I can start this this wonderful

machine on the 2nd kick EVER time, warm or cold (if it is warm I need to use the hot start if it will not light-up in two kicks).

I've richened the main up so that it pulls VERY well and does not go FLAT at the higher

RPM's and I've leaned it out on the bottom with a leaner pilot. The pblm with the bike

not starting well (for me at least) was that

it was too rich in the pilot circuit.

The bike is VERY responsive on the bottom and

pulls much better and is very crisp off of idle.

Here is the jetting:

Pilot - 40

Fuel screw - 2 turns out

Needle - Stock (can't remember the number).

Main - 182 (the 180 maybe OK but works well for me).

I'm ride at 100ft to 2000ft above sea level using 92 Octane pump gas.

Hope this helps!!

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