Prima Pipe on my roughhouse...what jet?

[locustfist]

What jet do I put in my carb to make the Prima pipe do it's thing best?

[Ray Knobs]

There is no one correct answer to question due to the many factors that go into carb tuning. Scooterworks claims these pipe were designed to not need a jet change. You should install the pipe and run it with the stock set up. You can increase the jet size if necessary.