Article Classic Amal Carb Tune Mk 1 [PDF]

Amal Concentric and Amal Mark II Carburetor Technical Manual

Download the complete PDF version using the green download button at the top right of this page for a detailed Amal carburetor technical manual covering both the Amal Concentric and Amal Mark II series. Originally published in Modern Cycle magazine, this reference combines tuning information, dimensional drawings, carburetor settings, exploded diagrams and service parts listings for classic British motorcycle applications including Norton, Triumph, BSA and Matchless models.

The first section focuses on the Amal Concentric carburetor, explaining how the pilot system, throttle cutaway, needle position and main jet each affect mixture strength through different throttle openings. It also includes tuning advice for altitude changes, racing applications, twin-carb synchronization and troubleshooting poor running, weak mixture, flooding and plug fouling.

Later sections move into the Amal Mark II series, covering the redesigned float system, rubber-mounted bodies, removable high-speed air bleeds, revised spray tubes and improved fuel control. Detailed exploded diagrams and dimensional charts are included throughout, together with service part numbers, needle charts, carburetor settings and tuning references for many popular motorcycles from the late 1960s through the 1970s.

Contents Include

• Amal Concentric carburetor technical information
• Amal Mark II carburetor design and tuning guide
• Throttle cutaway, needle and main jet tuning
• Pilot system adjustment procedures
• Twin carburetor balancing and synchronization
• Altitude and racing setup recommendations
• Exploded carburetor component diagrams
• Dimensional drawings and venturi sizing charts
• Service parts lists and replacement references
• Needle, jet and spray tube identification charts
• 1970s carburetor settings for British motorcycles
• Mark II rubber-mounted carburetor details
• High-speed air bleed tuning information
• Troubleshooting weak and rich running conditions