1998 YZ400F with a 03 450 card. Best jetting specs?


1 reply to this topic
  • slv240sx

Posted October 13, 2009 - 11:42 AM

#1

I know im not the first person to swap the carburetors. Wondering if any one knows what are the best jet sizes to start out with to get it tuned right? Bike also has hot cams.

Model:1998 YZ400f with 03 450 carb
Edit Revision Date:
Main Jet:????
Pilot Jet:????
Starter
Jet:????
Leak Jet (if any):
Fuel screw/Setting:????
Needle/Position:????
Filter:UNI
Pipe/muffler:03 YZ450
Altitude Range:1500 feet
Temp Range:40F-120F
Humidity Range:0%-40%

Comments: Phoenix desert riding mainly.

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  • grayracer513

Posted October 13, 2009 - 12:11 PM

#2

Start with the jetting used in a similarly situated '03 YZ450 and go form there.

http://www.thumperta...699#post2881699





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