Mikuni Carb Kit tuned by TC Bros. for 1976-1984 Yamaha XS650Mikuni Carb Kit tuned by TC Bros. for 1976 1984 Yamaha XS650 Dealing with tired, often mistreated stock CV carburetors that were engineered for fuel economy can be a futile task. Butterfly style carburetors provide excellent performance Better suited to applications without stock airbox Tuning kits contain components specially selected by TC Bros. for performance XS applications including slide, needle, and needle jet Suitable for bikes with big bore