YFZ450 Jetting ?

Reply Subscribe

Thread Tools

Search this Thread

Aug 31, 2003 | 02:01 PM

TRLYFZ450

Thread Starter

Pro Rider

Joined: Jun 2003

Posts: 290

Likes: 1

YFZ450 Jetting ?

I have the air box cover removed peashooter out and have done the cam mod. What should my jetting be.
I have a 175 main 5th clip on needle and a 45 pilot jet. Elevation is 500 feet. Thanks

Aug 31, 2003 | 08:35 PM

amsoil123

Trailblazer

Joined: Apr 2002

Posts: 77

Likes: 0

YFZ450 Jetting ?

Your stock needle will make you run lean......source:Sparks racing.For now use a 180 main.You need the needle from a 2003or4 yz450f,then change the main to a 170.Hope this helps.

Aug 31, 2003 | 09:11 PM

FX1660R

Trailblazer

Joined: Sep 2002

Posts: 48

Likes: 0

YFZ450 Jetting ?

did mine on dyno with same mod of you
best result was with:

#170
pilot#45
no lid
cammod
needle#5
mixt 2¼
peashooter in trashcan
elev 800'feets

i think your rich a little
MY DYNO