What jetting should I run

[bryceyz250f]

I have a 2001 yz250f. Stage one hot cams full FMF pipe twin-air air filter think that's all. I really have no clue what jets to run in it. I run 92-93 octane in it. If any of you could help that'd be much appreciated. Thanks.

[William1]

What problem are you having? That is more important than any blind reccomendation.

[bryceyz250f]

Only time it will run is with the choke on but the idle is really high as soon as I turn the idle off it shuts off

[William1]

Clean the carb

Buy a brand new pilot jet and install it, same size as is currently in the bike

Make sure the spring/washer/oring are on the fuel screw, set it at 1.75 turns from gently closed and ine adjust when the bike is hot.

[bryceyz250f]

What main should I run it had a 190 in it. I put a 185 in it today seemed to work but idk

[oldnbold]

What main should I run it had a 190 in it. I put a 185 in it today seemed to work but idk

what needle is in the bike? the reason I ask is the OEM needle for that model needed about a 170-178 needle. If the previous owner installed a JD Jet Kit needle, that needle used a 185 needle.

Like william1 said, clean the carb and change the pilot jet. The main jet doesn't affect idle.

Edited September 26, 2013 by oldnbold

[bryceyz250f]

Ok I got the bike to idle good, but when I'm riding I hit the gas and it bogs never happened before. Know anything?

[William1]

You put the AP spring in the diaphragm housing on the wrong side.

[bryceyz250f]

What ap spring?

[William1]

...or you lost it. The AP pump has a spring in it, It belongs in the cover side. Look at the parts fiche.

[bryceyz250f]

Never pulled the ap spring. Off its still there it still bogs and its kinda hard to start