Tri Z jetting for DG

[Tri-Z 490]

What jet change do I need for a DG pipe and silencer for a Tri-Z that is stock otherwise? What is the stock jet?

[TimSr]

Mine required no carburetion changes between stock, Cobra, and DG pipes. Mine is still stock, but cant tell you what size because Ive never had to change it.

[YTZ250#1]

According to my 86 manual,stock jets are.#320 MAIN,#35 PILOT.
If it ran good before new pipe you shouldent need to jet it much.I would
run it and check plug condition before making a jet change.

[YTZ250N]

funny thing is that a 85 used a 470main and 45 pilot with the air screw out 1 turn.