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What size main jets do I need?


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My brother been riding for 15 years so I doubt it. And no my brother is running a 4mill with vf3 reeds with a coolhead with 20cc domes and he's running stock carbs with 30 pilot jets and 360 main. And by the way our mechanic work for Yamaha.

 

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if your brother has been riding for 15 years, and your mechanic works for Yamaha, why come on here, ask questions then basically say they are wrong.

ask your brother or Yamaha mechanic.

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