I recently installed a CNS carb on my PK 80. The manifold that comes with it stinks, so I purchased the billet manifold from Pirate cycles. There are 5 adustable spots for the needle valve. I have mine on 3rd from the top. Fuel Air all away in then out 1 turn, Need to use some Gasket sealer on both sides of the manifold gasket and I used a lil on the carb end also. It runs great!