Keihin Carburetor
Keihin Carburetors: Race-Born Precision for Every Engine
Few names carry as much weight in the world of carburetion as Keihin. Founded in 1957, Keihin began producing carburetors in 1963 for Honda Motors, and that OEM heritage has defined the brand's reputation for meticulous engineering ever since. Today, Keihin carburetors span a remarkably diverse lineup — from general-purpose street units to purpose-built racing instruments — making them one of the most trusted names in powersports fuel delivery.
A Lineup Built Around Real-World Performance
What sets Keihin apart in the carburetor category is the sheer breadth and specialization of its product lines. Each series is engineered for a distinct application, so riders and tuners can match the right tool to the right engine:
- FCR (Flat-CR): Originally designed and developed on world-class Superbike racing circuits, the Flat-CR broke new technological ground with an innovative flat-slide throttle valve that rides on roller bearings — a practically frictionless design that allows for much lighter throttle return springs and a finer degree of power control. Available in down-draft and side-draft configurations from 28mm to 41mm throttle bore, it features a modular design for single, dual, and multi-cylinder applications.
- FCR-MX: The ultimate off-road performance carburetor for four-stroke engines, Keihin developed the FCR-MX for the specialized needs of motocross, flat track, off-road, and ATV racing.
- PWK: Keihin PWK carburetors have set the standard for two-stroke ATV, motocross, and off-road racing performance, featuring a chrome-plated D-shape cross-section slide that sets the modern benchmark. Available in 28, 33, 35, 36, 38, and 39mm throttle bores, there is a PWK for nearly any two-stroke engine configuration.
- CR Special: The legendary CR Special is Keihin's original smoothbore racing carburetor, featuring chrome-plated hollow slides that control smoothbore venturis to increase engine performance and rider control.
- PJ: The PJ is Keihin's first-generation flat-slide, two-stroke carburetor, featuring a chrome-plated oval cross-section slide and an innovative dual-action enrichener/idle speed adjuster, available in a 34mm throttle bore ideally suited to 125–250cc two-stroke singles or 350–500cc two-stroke twins.
- PE: The PE is the value-proposition within the Keihin off-road lineup — a round-slide, general-purpose carburetor available in a wide range of throttle bore sizes and applicable to both two-stroke and four-stroke engines.
OEM Trust, Aftermarket Performance
Beyond Honda, Keihin carburetors have been used in motorcycles from renowned brands such as Triumph, Suzuki, Kawasaki, KTM, Royal Enfield, and Harley-Davidson. That cross-brand OEM pedigree translates directly to aftermarket confidence — when you install a Keihin carburetor, you are fitting a unit built to factory tolerances and proven under the harshest racing conditions.
Keihin carburetors provide precise fuel/air mixture control, which is critical for engine performance and tuning. Whether you are chasing lap times or simply restoring a classic motorcycle to factory spec, the depth of Keihin's carburetor catalog — and the availability of jets, needles, and rebuild components across all series — means you can tune with confidence. Browse the full selection of carburetors or explore everything Keihin has to offer.