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YFZ450 Jetting ?

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Old 08-31-2003, 02:01 PM
TRLYFZ450's Avatar
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Default 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
 
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Old 08-31-2003, 08:35 PM
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Default 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.
 
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Old 08-31-2003, 09:11 PM
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Default 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
 
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Old 08-31-2003, 09:18 PM
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Default YFZ450 Jetting ?
Thanks
 
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