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Yz 144 Jetting Help

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Hi all, 

I recently picked up a 2006 yz 125 (bored out to a 144). I'm going to be putting on a pro circuit pipe and silencer. I know I'm most likely going to need to re jet it but where do I start. Should I stay stock and make adjustments from there or does anyone have a suggestion on what to start with.

For more details

  • New Hampshire, USA
  • 70-80 degree weather
  • 500-1,000 ft above sea level
  • V force 3 reeds
  • Pro circuit full exhaust
  • 144 Big Bore kit
  • Humidity will average from 70-75%

I appreciate any advice, thank!  

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