Keihin PWK28 Carb Right Side Idle
Choke, and air screw are on the left side.
A serial number is lightly imprinted below the PWK mark. The hoses should be a dark pink PLAS TECH hose. A “Motorcycle Race Use Only” label will be placed below the Keihin logo. Also various Quality Control marks should be visible. Genuine Keihin Jets should also have the jet size imprinted to the jet.