Keihin Carburetors

Keihin is a Japanese manufacturer known for high-performance carburetors and fuel-management systems for motorcycles and powersports engines. Their carburetors provide precise fuel/air mixture control, which is critical for engine performance and tuning.

Compatibility depends on the mounting orientation, bore size (diameter), intake boot or manifold match, and throttle linkage set-up. You’ll want to confirm the size in millimetres, that the carb will physically fit your intake setup, and that the jets/needles can be tuned for your engine application.

Yes, installing a new Keihin carburetor almost always requires jetting adjustment, especially if your bike has aftermarket pipes, air filters, or is modified. Jetting ensures the right air/fuel ratio for your riding conditions and modifications.

Keihin carburetors often offer improved throttle response, smoother mid-range power delivery, and better flow for performance applications. They also tend to have higher manufacturing precision and more tuning flexibility compared to many stock carburetors.

As with any performance carburetor, they require periodic cleaning, careful jetting, and correct setup; if neglected, performance may suffer. Also, some users feel they require more fine-tuning versus standard units.

No, if your bike is factory-equipped with fuel injection, converting to a carburetor like a Keihin is typically impractical, requires major modification, and may not meet emissions or reliability standards. Keihin carburetors are best suited to motorcycles originally designed for carbureted fueling systems.

Select a bore size that matches or slightly exceeds the intake port size of your cylinder head, considering engine displacement and RPM range. Using too large a carburetor can reduce low-end response, while too small may restrict top-end power, consulting engine tuning charts or a specialist is advised.

They don’t strictly require a particular brand, but because carburetors are very sensitive to airflow and intake conditions, you should use a high-quality, properly sized filter and ensure the intake boots or manifolds seal correctly. Improper intake accessories can upset jetting and degrade performance.