Mikuni 42-18

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Key item features

42mm smooth-bore carburetor: Optimized for improved airflow over stock CV (constant-velocity) carbs while maintaining rideability in street engines
Pre-jetted configuration: Delivered ready to run from the factory with base jetting that allows easier tuning rather than starting from scratch
Easy-fit kit design: Uses the original manifold, choke cable, throttle cables and air-box setup (for compatible years/models), making installation simpler and retaining original bike aesthetics
Air-box adapter included: The kit provides a special adapter so your stock air cleaner or approved performance filter can be used without major modifications
Flat slide throttle valve with roller bearings: Advanced throttle design improves throttle feel and responsiveness, reducing the lag common in older CV carbs
Broad application coverage: Specifically fit for 1990-1999 Big Twin Evo models and 1999-2006 Twin Cam models, making it versatile for many Harley V-twin builds
Stock look, performance upgrade: Designed to upgrade performance while preserving the factory appearance—a big plus for riders who want more power without radical visual changes.
After-market support & tuning potential: Though installed ready from Mikuni, the HSR42 platform supports further tuning via additional jets, needles, and accessories if your engine build evolves. (General Mikuni ethos)

Specs

Vehicle make
Harley-Davidson
Automotive specialty part type
Motorcycle Carburetor
Size
One Size
Brand
Mikuni
Vehicle type
Motorcycle
Color
Silver

Current price is $346.52

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Product details

Mikuni 42-18

42mm smooth-bore carburetor: Optimized for improved airflow over stock CV (constant-velocity) carbs while maintaining rideability in street engines
Pre-jetted configuration: Delivered ready to run from the factory with base jetting that allows easier tuning rather than starting from scratch
Easy-fit kit design: Uses the original manifold, choke cable, throttle cables and air-box setup (for compatible years/models), making installation simpler and retaining original bike aesthetics
Air-box adapter included: The kit provides a special adapter so your stock air cleaner or approved performance filter can be used without major modifications
Flat slide throttle valve with roller bearings: Advanced throttle design improves throttle feel and responsiveness, reducing the lag common in older CV carbs
Broad application coverage: Specifically fit for 1990-1999 Big Twin Evo models and 1999-2006 Twin Cam models, making it versatile for many Harley V-twin builds
Stock look, performance upgrade: Designed to upgrade performance while preserving the factory appearance—a big plus for riders who want more power without radical visual changes.
After-market support & tuning potential: Though installed ready from Mikuni, the HSR42 platform supports further tuning via additional jets, needles, and accessories if your engine build evolves. (General Mikuni ethos)

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Specifications

Vehicle make

Harley-Davidson

Automotive specialty part type

Motorcycle Carburetor

Size

One Size

Brand

Mikuni

Warranty

Warranty information

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Warnings

WARNING: “⚠ WARNING: This product can expose you to some chemicals, which is known to the State of California to cause For more information, go to www.p65warnings.ca.gov.xn--ivg