See more: Carburetors
Yost Pro Power Tube for Mikuni HSR42 and HSR45
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 H.P., improved mid range performance, and an incredible throttle response. Comes complete with rubber washer and the Yost Float Bowl Drain Nut.