Koso 28mm Throttle Body Honda Grom / Monkey A larger throttle body is essential for enhancing performance, as it facilitates a greater fuel intake, leading to increased power. The Koso 28 mm throttle body, combined with the 23 to 29mm intake manifold, optimizes the air/fuel mixture, resulting in a more rapid throttle response and improved performance. Features: 28mm throttle body Recommended for use with Koso Intake Manifold Includes throttle body O-ring