Shimming the needle jet of CV carburetor Suzuki Intruder 1500

Adding shim washers to the needle jets to richen up the air/fuel mixture for more power, especially after modifying the intake or exhaust system. I later replaced these washers with ones I made by cutting open an aluminum soda can, drilling two holes the same size as the fatter part of the jet, and then used scissors to cut them into washer shapes. Just personal preference, but I got back some of my gas mileage while keeping some of the added horsepower and torque. Be very careful with any of these internal