The "patched" diagram for the Mikuni BS25 carburetor is a legendary piece of mechanical lore, born in the early 2000s on greasy-fingered internet forums. It wasn't a factory update, but a community-led "patch" to fix a notorious design flaw in the pilot circuit that caused a lean-stumble on mid-range cruisers like the Yamaha Virago 250. The Origin Story

However, searching for a standard exploded view often leads to confusion. You may have stumbled upon the term "Mikuni BS25 carburetor diagram patched." This is not an official Mikuni document, but a community-driven modification to the original schematic.

Here are diagrams and exploded views of Mikuni BS and similar series carburetors to help identify these parts: 15+ Mikuni Motorcycle Carburetor Diagram Carburador Mikuni BS25 | PDF Sudco Intl. Corp. - Mikuni Diagrams Mikuni Carburetor Tuning, by Victory Library Victory Library

For further assistance, you may want to consult: