The part number on a Keihin carburetor is typically found on the side of the carburetor body or on the underside of the float bowl. It may be stamped or printed, and can often include a combination of letters and numbers. If you can’t locate it easily, consulting the specific model’s service manual may provide more detailed guidance.
Keihin 40mm "Butterfly"type Carburetor.
A keihin v571d5
A 2002 Sportster has a Keihin Constant Velocity (CV) carburetor, 40mm.
36mm Keihin PWK
The 1983 FXSB came stock with a Keihin B28E 38mm butterfly-type carburetor. First use of the Keihin CV carb was in '89 for Sportsters and '90 for all big-twins.
The OEM carburetor for a 1979 FLH-80 is a Keihin B78B butterfly type.
The 1983 FXSB came stock with a Keihin B28E 38mm carb, which is a butterfly-type, that is to say a non-CV (constant velocity) type. CV Keihins didn't appear until 1988.
Keihin Corporation was created on 1956-12-19.
The correct air-fuel mixture adjustment for a Keihin carburetor on a Honda XR200 typically involves setting the pilot screw to about 1.5 to 2.5 turns out from the fully seated position. This can vary slightly based on altitude and modifications, so it's best to start within this range and adjust as needed for optimal performance and smooth idling. Always ensure the engine is warm when making adjustments, and fine-tune based on throttle response and engine behavior.
Normally there is a metal tag attached with the Model # of the carburetor printed on it. It may or may not have the part #. The part # is usually stamped into the carb somewhere. Look everywhere especially on the base. Once you find the model # there are web sites that will identify what carb you have.
42 pilot 150 main for stock Keihin butterfly carb.
On most if not all 2-barrel and 4-barrel carburetors the part number is located on the front left (driver's)side of the air horn.