Mikuni''s TM Series flat side carburetors provide a significant performance improvement over older round slide carburetors. Air flows faster and smoother through the TM Series venturi and jet blocks due to the flat slide design which help create a smooth bore effect. The high velocity air flow means a stronger vacuum at the needle jet for more precise metering; better throttle response. - Carb only; choke cable included - HS40. Note: This is the early HS40 carburetor; without roller bearings that support the throttle slide. Includes choke cable.