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Keihin CV Carburetors

Keihin CV Carburetors

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Keihin CV carburetors

At the end of the 1980s, further restrictions of exhaust emission values meant the end of butterfly carburetors. Harley-Davidson installed CV carburetors from Keihin in the Sportster model series from 1988 and in the Big Twin engines from 1990.

CV is the abbreviation for Constant Velocity. While the throttle grip still operates a throttle disc, the constriction in the venturi is replaced by a slide. This slide is linked to the vacuum in the intake manifold and reacts to pressure changes: the higher the vacuum, the wider the slide opens. In terms of flow technology, this means that the speed of the incoming air below the slide valve remains almost constant. And this speed regulates the atomization of the fuel. There is also a needle on the slide that regulates the amount of fuel atomized by the air. A CV carburetor therefore does not react directly to the opening or closing of the throttle grip. This has earned it the reputation of being a performance brake and is, to be honest, nonsense. However, it prevents an engine from choking by only producing as much mixture as the engine can handle at the current engine speed. The performance which a CV carburetor can provide for an engine depends on its tuning, as with any other carburetor. And this is exactly why tuning kits are available, for example from Dynojet.

Complete carburetors

For all those who want to explore the possibilities of a CV carburetor or need a complete replacement, we offer it in original tuning state. There are also jets and slides, floats, springs and small parts, as well as gaskets and sealing rings. The brands Bates, Dynojet, Fork, Moon and VM offer a wide selection of matching accessories for the CV.

Have any questions?

Our service team will be glad to help out: Mondays - Thursdays 08:00-17:00 CET, Fridays 08:00-16:00 CET, Phone: +49 / 931 250 61 16, eMail: service@wwag.com