YOST powertube Mikuni HSR42 & HSR45 carb For Harley-Davidson

The Yost Pro Power Tube for Mikuni, by design, produces a very fine mist. This allows the fuel to stay in suspension longer for better control of air and fuel mixtures and can be almost perfectly matched for any throttle position. You can expect an increase of up to five HP, improved mid range performance, and an incredible throttle response. Comes complete with rubber washer and the Yost Float Bowl Drain Nut.