Our carburetor rebuild kits are comparable to the original Napco kits, which were the most complete on the market. Carb rebuild kits were an aftermarket creation of the 1970s and Napco and Keyster were the most popular brands. The publicly accepted notion of that period was that a true rebuild kit contain gaskets, o-rings, jets, needles and float assemblies.
It can be impossible to thoroughly clean years of gasoline and fuel additive build up from the carburetor needles, jets and floats so replacements of these components are included in each rebuild kit but the originals do not have to be replaced.
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Honda never made the conventional carburetor rebuild kits but sold gasket kits which you can buy today. But the jets and needles must be purchased separately. Jets and needles have varied from the original specs due to carburetion refinements that were periodically reported through Honda bulletins, a result of field research, legislative regulation and feedback from the dealer and customer base.
Keihin VB or venturi bore carburetors are basically the same carburetor except for the size of the venturi, as indicated by the two numbers that follow the ID as in VB48 or VB53. Notice the float bowl and gasket is the same size for all GL1000 model years. Some components inside the float bowl can be interchanged between the VB carburetor family.
At one time, Napco (Nippon Automotive Parts Company) and Keyster relied on Keihin to supply the OEM components for their rebuild kits on what is called the gray market.
Honda OEM Gasket Set Numbers: