06 yz450f carb jetting w/ new big bore kit ?

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.

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.

Find new shop

Haha

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

478cc So you think not even a little richer?

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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