Another jetting question!

[Drtridr18]

2001 400ex
+
Yoshimura Slip-On
+
K&N Power Kit/Filter and Outerwears
+
Airbox Lid On (at least for now)
+
Northern Ohio Climate
=


What Jet Size(to start with)?

150-160 range??


Thank you for your help everybody!

[Wheelie]

I'm not sure if the K&N Power Kit uses the same jet #'s as a keihin jet.

If it does, a 150 or 152mj, start with the 150 and see how it runs.

[stevengates45]

I've found that when you jet a carb the only way to do it is strictly guess! Uugghhhh, I hate jetting stuff though!

[Sandragggen]

If you are below 3000' above sea level and at this cold time of year. I would start at 165 maybe 168 main jets with airbox lid on and work your way down. Your better off starting off rich than lean. Like Wheelie said some of the aftermarket jets will vary from stock Kiehin.....that is a K&N 150 may equal to a 165 Kiehen jet. The numbers are for a example only.