Colorado 07 YZ450


1 reply to this topic
  • pbviking

Posted May 19, 2009 - 03:47 PM

#1

Can anyone provide some recommendations on jetting. I have the stock jetting now but when I let off the the gas the bike backfires.

Here is what I am thinking

Main Jet: 160 no change
Pilot Jet: 45 (go to 48)
Starter Jet: 72 no change
Leak Jet (if any): 55 no change
Fuel screw/Setting: 1.25-1.75 turns out (adjust according)
Needle/Position: NFLR-4 (move the needle on 1 notch leaner)

Altitude is 5-9K

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  • grayracer513

Posted May 19, 2009 - 07:30 PM

#2

Have you read these?:

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http://www.thumperta...599#post3710599

http://www.thumperta...ad.php?t=694921





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