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Mikuni Racing HSR – Carburetors – Jetting Kits – Rebuild Kits – Covers
Special Order – These items are Drop Ship-able from Mikuni American – Please inquire for current availability and lead times.
Mikuni HSR Smoothbore Carburetors
The Mikuni HSR Carburetor Series is engineered for serious riders seeking peak performance from idle to wide-open throttle on their American-made V-Twin engines—all without sacrificing reliability. Offered in 42, 45, and 48mm throttle bore sizes, HSR Series carburetors deliver better throttle response, more torque, and more horsepower. Available individually, as bolt-on kits that retain your bike’s classic look, or as complete kits for serious performance enhancement. Built to provide smooth, steady acceleration and a significant horsepower boost, the HSR series gives you everything needed to fine-tune your ride and elevate your experience on the open road.
Mikuni HSR Individual Carburetors
Mikuni HSR Carburetors are designed for performance engine builders who need a standalone carburetor for custom and race applications. These carburetors are available in both standard aluminum and polished finishes to suit various aesthetic and functional preferences. Each carburetor includes a choke cable, except for the TM42-6 model, which utilizes the stock choke cable from a CV-type carburetor. Choke cables are available separately.
| Description | Part Number | More Info |
| HSR 45mm Carburetor (Standard finish) | #TM45-2K | More Info |
| HSR 45mm Carburetor (Polished finish) | #TM45-2PK | More Info |
| HSR 42mm Carburetor (Standard finish | #TM42-6 | More Info |
| HSR 42mm Carburetor (Polished finish) | #TM42-6PK | More Info |
Mikuni HSR Easy Kits Carburetors
Mikuni Easy Kits are designed to preserve the stock appearance of your bike while offering enhanced performance gains. These kits work with the original Harley-Davidson intake manifold, choke cable, air cleaner, and throttle cables, ensuring a perfect fit without altering the bike’s classic look. Each kit includes a specialized adapter for high-performance air filters. Additionally, California A.R.B. Legal Kits are available for EVO Big Twin applications, ensuring compliance with state emissions regulations.
| Description | Part Number | More Info |
| For 1990-1999 1340 Big Twin Evo with Stock CV Type Manifold | #42-7 | More Info |
| For 1999 to present Twin Cam, 1990 to 1999 Big Twin Evo | #45-5 | More Info |
| CA Legal Kit for 1990 to 1998 1340 Big Twin Evolution models sold in California | #42-6 | More Info |
| For 1999 to 2006 Twin Cam, 1990 to ‘99 Big Twin Evo | #42-18 | More Info |
| For 1994 to 2004 Sportster 1200 | #42-10 | More Info |
| For 1994 to 2006 Sportster 1200, Buell models | #42-11 | More Info |
Mikuni HSR Total Kits Carburetors
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.
| Description | Part Number | More Info |
| For 1984 to 1999 1340 Big Twin Evo | #42-8 | More Info |
| For 1999 to present Twin Cam 88/95 | #42-19 | More Info |
| For 1984 to 1999 1340 Big Twin Evo | #45-2 | More Info |
| For 1984 to 1999 1340 Big Twin Evo | #45-3 | More Info |
| For 1999 to present Twin Cam 88/95 | #45-4 | More Info |
Mikuni HSR Race Kits Carburetors
The Mikuni HSR48 Race Kit offers unparalleled airflow and precise fuel metering, delivering maximum power and responsive throttle control for serious race engine builders and performance enthusiasts. Designed for 120ci or larger engines with high-flow heads and cams, this kit ensures optimal fuel delivery with an extended main jet and a larger needle valve assembly, catering to the demands of high-powered motors. The kit includes a 48mm smoothbore carburetor, rubber mounting flange (with 78mm bolt hole centers), choke cable, and four main jets. It utilizes stock Harley CV-type cables and is intended for use by experienced builders. Please note that the manifold and air filter are not included.
| Description | Part Number | More Info |
| For high power, custom build applications (Standard Finish) | #48-2 | More Info |
| For high power, custom build applications (Polished Finish) | #48-2P | More Info |
Mikuni HSR Carburetor – Jetting Kits – Rebuild Kits – Covers
| Product Type | Description | Part Number | More Info |
| Jetting Kit | For Mikuni HSR42 Carburetors | #KHS-025 | More Info |
| Jetting kit | For Mikuni HSR45 Carburetors | #KHS-045 | More Info |
| Jetting Kit | For Mikuni HSR48 Carburetors | #KHS-048 | More Info |
| Rebuild Kit | For Mikuni HSR42/45mm Carburetors with 4.2 needle valve | #KHS-016 | More Info |
| Rebuild Kit | For Mikuni HSR42/45mm Carburetors with 2.3 needle valve | #KHS-017 | More Info |
| Rebuild Kit | For Mikuni HSR 48 Carburetors with 4.5 needle Valve Assembly | #KHS-031 | More Info |
| Carburetor Cover | Mikuni Chrome Top Carburetor Cover without Mikuni Logo – HSR42 / HSR45 | #KHS-028 | More Info |
| Carburetor Cover | Mikuni Chrome Top Carburetor Cover with Mikuni Logo – HSR42 / HSR45 | #KHS-029 | More Info |
| Carburetor Cover | Mikuni Black Top Carburetor Cover with Mikuni Logo – HSR42 / HSR45 | #KHS-036 | More Info |
| Carburetor Cover | Mikuni Chrome Top Carburetor Cover with Mikuni Logo – HSR48 | #KHS-032 | More Info |
Special Order – These items are Drop Ship-able from Mikuni American – Please inquire for current availability and lead times.