Keihin CDK carburettors are designed for use in racing motorboats and motorcycles, and brands such as Harley-Davidson, Kawasaki and Yamaha all have used this particular carburettor. The Keihin CDK carburettors have been discontinued, but the company still offers replacement parts and repair kits. Determining which particular carburettor you have is easily done, as you can either check yours against images from their website or ask a distributor about your serial number for an exact identification.
Go to the website for Keihin Fuel Systems, Inc: keihin-us.com.
Click on the "Products" menu to see images of all their available carburettors.
Click on "CDKII Carburetors" to see the full range of that particular type of carburettor. Compare your carburettor to the images in this section to determine the exact type of your carburettor.
Remove your carburettor and place it on a flat surface. Look at the regulator chamber, where you'll be able to see the Keihin trademark logo, to ensure that you're dealing with the correct brand.
Find the serial number near the bottom of the CDK carburettor. Write the number down.
Call one of the distributors listed on the keihin-us.com website and give them your serial number. Distributors keep track of serial numbers and will be able to identify your particular carburettor.