BSA B40 Parts List Manual

🏍️ Essential Restoration Guide: BSA B40 (350 Star) Parts List / Spares Catalog

🌟 The Blueprint for Restoring Your Classic British Single!

Do you own or are you restoring the iconic BSA B40 (350 Star)? This is the definitive Parts List (Spares Catalog)—the most critical resource for any owner, mechanic, or restorer. While a service manual tells you how to fix it, this Parts List shows you exactly what goes where. It is the visual map required to identify missing components, order correct replacements, and assemble the motorcycle with factory precision.

This comprehensive guide features detailed Exploded View Diagrams of every assembly, paired with the original OEM Part Numbers. It is the ultimate authority for navigating the complexities of the 350cc unit-construction engine and chassis.

📝 Key Features for Precision Restoration

This professional resource is uniquely designed to solve the puzzle of vintage motorcycle assembly:

Exploded Assembly Diagrams: Features high-clarity "blown-up" views of complex components (like the gearbox and clutch), showing the exact order of washers, spacers, and circlips—information often missing from workshop manuals.

Original Part Numbers: Lists the authentic BSA Factory Part Numbers for every single screw, gasket, and piston. This is essential for searching online (eBay, specialist dealers) to find the exact New Old Stock (NOS) or reproduction spares you need.

Assembly Sequence: Acts as a visual assembly guide, allowing you to see how components fit together before you start wrenching.

Component Identification: Helps you distinguish between correct original parts and incorrect aftermarket modifications made by previous owners over the last 60 years.

🎯 Core Bike Systems Covered

The manual provides focused, detailed breakdown of the entire machine:

Unit Construction Engine: Complete breakdown of the 350cc cylinder head, barrel, crankshaft, valve train, and timing gear.

Transmission & Clutch: Detailed diagrams of the 4-speed