jetting question yz426f 2002

6 replies to this topic
  • rebelrider

Posted November 18, 2005 - 01:54 PM


anybody know the proper jetting for this model?

aftermarket exhaust (brand unknown)

need quick assistance


friend wants to know if there is a raceing setting for jetting too, i told him i think thats only with aftermarket exhaust.......

  • Yak

Posted November 18, 2005 - 02:01 PM


Stock is:

42 Pilot Jet
4th clip down on needle
162 Main Jet


Posted November 18, 2005 - 02:09 PM


Stock is:

42 Pilot Jet
4th clip down on needle
162 Main Jet

Yep, I can vouch for that.

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  • rebelrider

Posted November 18, 2005 - 02:15 PM


cool, still need to check his to see what his is set at.....

do ya'lls head pipes glow red while at a stop, then cool off once moving
he said that when wide open it stops glowing, but out back when he first starts it up even at idle, his head pipe glows, ive lit my cigerette off it without even touching the darn thing...... any suggestions

  • Yak

Posted November 18, 2005 - 02:35 PM


Thats normal... Nothing to be alarmed about.

  • 642MX

Posted November 18, 2005 - 04:38 PM


My jetting is:
pilot 42 (stock)
needle (stock)
main jet 160
fuel screw 1.75 turns out

  • rasta

Posted November 18, 2005 - 05:27 PM


i have a hmf performance slip on on my 02 and tried every clip position and jet size . it still rides like a 2-stroke

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