High Altitude Jetting for 2004 Suzuki RMZ 250

[BloodyShadow23]

Hey Guys,

I live in Colorado and am having trouble jetting my bike. I currently have a FMF Powerbomb header and FMF Q4 slip-on as well. The current jetting is 40, 65, 150 for pilot, needle, and main. I am backfiring and getting NO power at 1/2 to full throttle.

Thanks for your guys' help!

Andrew

[doug2121]

what kind of bike

[BloodyShadow23]

It's in the title lol.

Edited July 14, 2013 by BloodyShadow23

[FORMA MOTO]

Hey Guys,

I live in Colorado and am having trouble jetting my bike. I currently have a FMF Powerbomb header and FMF Q4 slip-on as well. The current jetting is 40, 65, 150 for pilot, needle, and main. I am backfiring and getting NO power at 1/2 to full throttle.

Thanks for your guys' help!

Andrew

Colorado is a big state. 5000ft? 12,000ft elevation

You are WAY too lean....

...and there is no such thing as a 65 needle.....

You need to be more like 42/ NCVS/ 160, and put on a remote fuel screw so you can properly adjust it. That's the only way to know if you have the correct pilot jet.

Read the fuel screw adjustment faq.

Edited July 14, 2013 by Krannie