20mm Round Slide Carburetor

The Mikuni VM20-273 is a 20mm round slide carburetor that has established itself as a performance standard for single and multi-cylinder motorcycles and ATVs. Manufactured in Japan, this carburetor is engineered for versatility, working with both 2-stroke and 4-stroke engines and finding use in applications ranging from street riding to motocross, enduro, and various racing disciplines. This carburetor offers a 20mm venturi size and features a bolt-on flange mount. Its design includes a compact form factor with specific dimensions: a carburetor depth of 66mm, height of 115mm, and width of 76.5mm. The intake bell diameter is 43mm, and the engine side features 51mm center-to-center bolt hole spacing. It operates with a left-side idle location and does not include an accelerator pump. The VM20-273 is equipped with standard jetting, including a VM4/042 main jet (180) and an M28/1001 pilot jet (22.5), though it's important to note that the main jet is housed within a jet extender/drain plug assembly at the base of the float bowl, differing from typical VM carburetor configurations. Mikuni also specifies that no alternate needle jet is available for this model. While advertised as a universal fit, buyers are advised to carefully review the specifications to ensure compatibility with their specific vehicle. The Mikuni VM20-273 is noted as a direct OEM replacement for the 1987-1992 Yamaha YSR50 and is also recognized as a suitable option for various other small-displacement engines. However, it's crucial to match the carb's specifications, such as bore size and mounting dimensions, to the original equipment for optimal performance and fitment. Extensive tuning components are available to fine-tune the fuel mixture for diverse applications and riding conditions.