Buell HSR42 needle size 98 for tuning the Torque Hammer exhaust.
This needle with the pilot 25, main jet 165, is the perfect setup and tested in our Dyno for many customers with 2 inch and 2,5 inch version headers.
We recommand to use the lowest clip position on the needle. Depending on the airbox you can try 1-2 positions higher.
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