• Matchbox Vintage Racing and Restorations by Robert Allen of Eastsound, WA
• Michael Moore runs a Vintage Roadracing mailing list and collects information on frame building
• Tony Foale's excellent site on chassis design and construction
• Eric Kalamaja's Sundial Motorsports with great articles on T500 Suzukis and CB350's
• Aircraft Spruce and Specialties - everything you need to build an airplane (or motorcycle!)
• Motorcycle Yellow Pages
• Information on the building of Honda CB450 / CB500 twins
• A Salvage Yard Directory
• Classic Motorcycle Fibreglass
• Central Wheel Components - Source for alloy rims and SS spokes
• DomiRacer
• Data Acquisition Systems from SmartKart
• Lindsay Publishers - Books on a variety of engineering / craft production techniques
• Europark - An incredible collection of GP machine specifications and technical photos
• Build your own Flowbench
• SuperFlow flowbenches and dynos
• Northwest Sleeve - Sleeve manufacturer if you're building homemade cylinders
• Online Motorcycle Museum
• Penske Racing Shocks
• Suzuki TR500 Race Preparation information
• Yamaha RD 350 information from Mike Hammer (RD Tuning info is way at the bottom of the page)
• Lots of information of building Yamaha XS650 motors [1], [2], [3]

Sound of Singles / 125cc Racing