Keihin Carburetors & Accessories

Keihin Carburetors & Accessories: Race-Proven Fuel Delivery

Keihin has been synonymous with high-precision fuel delivery since its founding in 1956, and no part of their catalog makes that reputation more tangible than their carburetors and carburetor accessories. Whether you're rebuilding a stock powersports engine or chasing podiums on the motocross circuit, Keihin's carburetor lineup offers a purpose-built solution for virtually every application.

A Lineup Built Around Specific Performance Needs

What separates Keihin from the competition is the depth and specialization of their carburetor range. Rather than offering one-size-fits-all units, Keihin has engineered distinct product families for distinct disciplines.

• FCR-MX: Widely regarded as the ultimate four-stroke off-road carburetor, the FCR-MX was developed specifically for motocross, flat track, off-road, and ATV racing. It features a roller bearing-supported flat slide, an adjustable accelerator pump, a large baffled float bowl for rough terrain stability, quad float bowl vents, and an optional hot-restart knob — arriving race-ready out of the box.
• PWK: The benchmark for two-stroke performance carburetors, the PWK series features a chromed semi-flat (D-shape) throttle valve engineered for excellent response and flow at high RPM. Available in throttle bores from 28mm through 39mm, it also incorporates Keihin's proprietary "Quad Vents" to eliminate post-jump bogging, and "Air Strikers" that direct airflow to the main nozzle for sharper throttle response.
• CR Special: Keihin's legendary original smoothbore racing carburetor, featuring chrome-plated hollow slides that control smoothbore venturis for maximum airflow. The CR Special is available in throttle bore sizes from 26mm to 39mm and is configured for single, twin, and four-cylinder side-draft engine applications.
• PE: The versatile, value-oriented entry in the Keihin off-road lineup. The PE is a round-slide, general-purpose carburetor available in venturi sizes between 20mm and 38mm, compatible with both two-stroke and four-stroke engines — and delivering industry-leading Keihin fit and finish at an accessible price point.
• PWM: A 38mm short-body carburetor designed expressly for high-RPM two-stroke racing in road racing, flat track, and shifter kart applications where peak power output is the priority.

Jetting Parts & Accessories: Dialing In the Perfect Tune

Beyond the carburetors themselves, Keihin supports serious tuners with a comprehensive range of carburetor accessories, including main jets, needle jets, slow jets, and rebuild hardware. This parts ecosystem makes trackside jetting adjustments straightforward, letting riders fine-tune air-fuel mixtures to match elevation, temperature, and engine state of tune without specialized tools.

Why Keihin Carburetors Stand Out

Keihin's credibility in carburetion comes from decades as a major OEM supplier to leading Japanese motorcycle manufacturers, as well as brands like Triumph, KTM, and Harley-Davidson. That OEM-grade precision — tight tolerances, quality materials, and predictable tuning behavior — carries directly into their aftermarket carburetor products. For powersports enthusiasts, that means a carburetor that behaves consistently across a wide range of conditions and responds predictably to jetting changes.

Explore the complete Keihin brand catalog or browse all carburetors and accessories to find the right fuel delivery solution for your build.