Carb

Eliminates hesitation and boggingBetter holeshotsProvides instant response to throttle movementsStarts easierReduces hot engine stallingImproves low end performanceBolt-on product that requires no modificationNew 2nd generation products use left hand...

Boyesen Engineering has now released the NEW QuickStart. Hot engine starting is no longer a problem and is available for ALL Keihin FCR carbureted MX, Offroad and ATV models. The patented performance of the proven QuickShot system, now with adjustable...

BOYESEN engineers embarked on a mission to create a new lineage of aerodynamic intake technology by refining the primary performance factors required to increase peak horsepower through design innovation: Aerodynamic Surface Optimization, Model-Specific...

BOYESEN engineers embarked on a mission to create a new lineage of aerodynamic intake technology by refining the primary performance factors required to increase peak horsepower through design innovation: Aerodynamic Surface Optimization, Model-Specific...

BOYESEN engineers embarked on a mission to create a new lineage of aerodynamic intake technology by refining the primary performance factors required to increase peak horsepower through design innovation: Aerodynamic Surface Optimization, Model-Specific...

BOYESEN engineers embarked on a mission to create a new lineage of aerodynamic intake technology by refining the primary performance factors required to increase peak horsepower through design innovation: Aerodynamic Surface Optimization, Model-Specific...

BOYESEN engineers embarked on a mission to create a new lineage of aerodynamic intake technology by refining the primary performance factors required to increase peak horsepower through design innovation: Aerodynamic Surface Optimization, Model-Specific...

Uses symmetrical reed petals, no more inner and outer petalsIncorporates the industries first and only patented snap together reed valve design. The entire assembly is completely screw freeCustom air guides specific to each individual application ensures...

BOYESEN engineers embarked on a mission to create a new lineage of aerodynamic intake technology by refining the primary performance factors required to increase peak horsepower through design innovation: Aerodynamic Surface Optimization, Model-Specific...

BOYESEN engineers embarked on a mission to create a new lineage of aerodynamic intake technology by refining the primary performance factors required to increase peak horsepower through design innovation: Aerodynamic Surface Optimization, Model-Specific...

Each Boyesen RAD Valve is unique - tailor made to that model, year and displacement.The intake charge is redirected for more even distribution to the intake portsConstant flow velocity is maintained for instant throttle response and more horsepowerOne...

BOYESEN engineers embarked on a mission to create a new lineage of aerodynamic intake technology by refining the primary performance factors required to increase peak horsepower through design innovation: Aerodynamic Surface Optimization, Model-Specific...