This is an authentic vintage Mikuni Kogyo carburetor vacuum diaphragm top cap designed for constant-velocity (CV) carburetors. It protects the vacuum slide and rubber diaphragm while securing the return spring. The cap features a square aluminum base with rounded corners, an internal dome, four mounting bolt holes, and a central guide tube. Compatible Models This casting code 2A2 cap is commonly associated with Mikuni BS32 or similar CV carburetors used on late-1970s to early-1980s Japanese motorcycles. Yamaha Models: * Yamaha XS250 (1979–1980) * Yamaha XS360 (1976–1977) * Yamaha XS400 (1977–1982) * Yamaha SR250 Exciter (1980–1982) * Yamaha XS750 Special / Triple (1977–1979) * Yamaha XS1100 / Eleven (1978–1981) Other Possible Adaptations: * Select Suzuki GS-series models, including early GS400, GS425, and GS550 motorcycles using compatible 32mm Mikuni BS-series carburetors.
Please verify compatibility with your specific motorcycle model before purchasing.
Cleaning Status
partially_cleaned
Cleaning Notes
Used stain remover
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Yes, all parts with OEM numbers are genuine manufacturer parts. Check the specifications tab for the OEM number.
We offer a 30-day return policy. Items must be in original condition. See the Shipping tab for complete details.
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Parts are sold separately. We recommend professional installation for safety and warranty purposes.
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