Mikuni HSR Series Carburetor Total Kits – HSR45 Kit #45-3 – Fits Harley-Davidson 1984-1999 1340cc Big Twin Evo. Includes a 45 mm big bore carburetor, breather kit #KHS-020 and a 45mm flange.
Note: Use your stock throttle cables. Does Not include Intake Manifold.
Special Order Item – This item Drop Ship-able from Mikuni American. Please inquire for availability and lead times.
Every Mikuni Carburetor Kit is an easy bolt-on application. Each HSR carburetor in the kit comes pre-jetted and ready to run!
Mikuni HSR Total Kits come complete with either a 42mm or 45mm HSR carburetor, a new performance manifold, rubber flange, high-flow air filter, chrome cover, chrome breather kit, and all necessary mounting hardware. The high-flow air filter is capable of supporting up to 100 horsepower without any loss due to air restriction. These kits are compatible with stock throttle cables from 1992 and later models, though manifold clamps and seals are not included.
Complete Total Kit – Includes HSR45 carburetor, breather kit, mounting hardware, and SE-style air cleaner adapter
Built for Big Power – 45mm flatslide carb delivers massive airflow and throttle response for highly modified V-twin engines
Maximum Fuel Delivery – Smoothbore venturi and precision fuel atomization improve top-end horsepower and torque
Includes SE-Style Air Cleaner Adapter – Designed for use with Screamin’ Eagle-type air cleaner backing plates (not compatible with CV-style air filters)
Fits Harley Big Twins – Compatible with EVO (1984–1999) and Twin Cam (1999–2006) models with cable-operated throttle systems.
Unleash the full potential of your high-performance V-twin with the Mikuni HSR45 Total Kit (45-3)—a complete, bolt-on carburetor upgrade engineered for maximum airflow, throttle response, and horsepower. The 45mm HSR45, this kit is built for serious engines with modified heads, big-bore cylinders, and aggressive cam profiles.
Perfect for Harley-Davidson EVO and Twin Cam Big Twin engines, the 45-3 Total Kit includes everything needed for a smooth installation, plus a high-performance Screamin’ Eagle-style air cleaner backing plate adapter to match your engine’s appetite for air and fuel.
45mm HSR Flatslide Carburetor – Mikuni’s largest HSR carb delivers maximum fuel and airflow for heavily modified engines
Total Kit with Everything You Need – Includes carb, breather kit, mounting hardware, and Screamin’ Eagle-type air cleaner adapter
Race-Proven Design – Smoothbore venturi and flatslide throttle provide lightning-fast response and improved atomization
Optimized for Big-Bore Builds – Best suited for 95ci+ engines or those with performance upgrades like high-compression pistons and ported heads
Pre-Jetted for Modified Applications – Set up to run with minimal adjustment on performance engines
Kit Number: 45-3 | Carb Model: TM45-2 / HSR45 | Bore Size: 45mm | Type: Flatslide, Smoothbore | Breather Kit: Included | Air Cleaner Adapter: Screamin’ Eagle-style backing plate adapter (not CV-style)
Compatibility: Designed for Harley-Davidson Big Twin models including EVO (1984–1999) and Twin Cam (1999–2006, cable throttle only). Not compatible with fuel-injected or throttle-by-wire models.
Note: Best suited for engines with significant performance upgrades. CV-style air cleaners will not fit this adapter—use with aftermarket or SE-style air cleaner assemblies. FOR OFF-ROAD/RACE USE ONLY.
Carburetor kits not designated as C.A.R.B. exempt, are not legal for motor vehicles operated on public highways in the state of California or in other states and countries where similar anti-pollution laws may apply.
