Strange Stock Jetting for 01 YZ250F

[Nstyle]

My bike came with a # 42 Pilot Jet. I thought #40 Pilot Jet was stock on the 2001 YZs?? So if I'm now running a 45 Pilot Jet, is that richer or leaner??

My Jetting:

Main Jet: 175

Pilot Jet: 45

Fuel Srew: 1 1/4 Turns out

[skthom2320]

Bigger = richer

[SSchulz]

#42 pilot jet was stock for the 01

[SUnruh]

PJ 42, PAJ 100, MJ 175, MAJ 200, needle ELP clip 4, fuel screw 1.75 was stock for '01.

the 40 became standard in '02.