06 yz450f carb jetting w/ new big bore kit ?


6 replies to this topic
  • bfarmer

Posted December 25, 2015 - 11:05 AM

#1

Need help with proper jetting on stock carb, '06 yz450f w/ a new big bore kit just added?
Shop did work, don't idle and back fires.

  • bfarmer

Posted December 25, 2015 - 11:06 AM

#2

Need help with proper jetting on stock carb, '06 yz450f w/ a new big bore kit just added?
Shop did work, don't idle and back fires.



  • 15thumper

Posted December 25, 2015 - 11:15 AM

#3

Find new shop

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  • bfarmer

Posted December 25, 2015 - 11:19 AM

#4

Haha

  • stevethe

Posted December 25, 2015 - 11:29 AM

#5

Put a brand new stock pilot jet in, adjust the fuel screw and run it. It shouldn't need much in the way of different jets.

Edited by stevethe, December 25, 2015 - 11:30 AM.


  • bfarmer

Posted December 25, 2015 - 11:30 AM

#6

478cc So you think not even a little richer?

  • grayracer513

Posted December 26, 2015 - 07:54 AM

#7

No, not necessarily.  The bigger engine produces a stronger intake signal through the carb, and may even need to be leaner.  The backfiring and idle problems do sound like a pilot jet problem.  They clog very easily if they sit for any length of time. 







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