This is a set of 4 vintage Keihin carburetors. These recently came out of the estate of a long time car and motorcycle collector. Each carb is stamped 657A KG and then a symbol or Japanese letter as shown. The carbs are in very good unrestored condition. All parts move freely. These carbs came out of cool, dry storage where there had likely been for decades. These carbs are being sold as good cores for rebuilding. I believe these carbs to be applicable to late 60's-70's Honda CB750 models and may also fit others. Please confirm your specific application.