Welcome to the Technical Information Blog dedicated to the fun and always fascinating world of vintage Triumph, Norton, and BSA motorcycle parts. This blog serves as a comprehensive resource for enthusiasts and collectors who are passionate about these iconic British motorcycle brands.
Our Most Recent Tech Blogs
Motorcycle Chains and Sprockets
Mike Grage, Customer and Technical Support at The Bonneville Shop and British Iron. As any seasoned rider knows the easiest modifications…
Understanding the Choke on Amal Concentric MK1 Series Carburetors
Amal Concentric MK1 Choke Dave Porter, Customer and Technical Support at the Bonneville Shop Occasionally, the…
Triumph Exhaust System Design
From Mike Grage: Customer and Technical Support at The Bonneville Shop and British Iron One of the most discussed subjects that…
A Guide to British Motorcycle Basket Case Projects
A Guide to Motorcycle Basket Case Dave Porter, Technical and Customer Support at The Bonneville Shop The opportunity to acquire a…
Process Guide: Lacing a Cross 3 Pattern Rear Disc Wheel
Lacing a Cross 3 Pattern Rear Disc Wheel A note about Lacing a Cross 3 Pattern Rear Disc Wheel: Your new…
446 LED Update for 2026
Mike Grage, Technical and Customer Support at The Bonneville Shop and British Iron 446 LED Update for 2026 There have been a…
Wheel Building – Starting For Success
Dave Porter, Technical and Customer Support at The Bonneville Shop. Motorcycle Wheel Building One of the more satisfying elements of the…
Handlebar Changes and cables
Considerations for Handlebar Changes By Mike Grage, Technical and Customer Support at The Bonneville Shop and British Iron. Most people in the…
An Overview of the Smith’s BG5330 Speedometer Drive Units
An Overview of the Smith’s BG5330 Speedometer Drive Units By Dave Porter, Technical and Customer Support at The Bonneville Shop …
Part 3: Resurrecting A Barn Find Hinckley
Hinckley Triumph Maintenance and Restoration Part 3: Resurrecting A Barn Find Hinckley By Mike Grage, Technical and Customer Support at The…
Fitting the Lucas 36403 Ammeter
early 2AR Lucas 36403 ammeters By Dave Porter, Technical and Customer Support at The Bonneville Shop Lucas supplied the…
Triumph T140 Rear Rim
Triumph T140 Rear Rim Retrofit and Service Bulletin 4-77 By Dave Porter, Technical and Customer Support at The Bonneville Shop Triumph T140…
A Look at the Amal Concentric Floats
By Dave Porter, Technical and Customer Support at The Bonneville Shop In this blog I will cover some information regarding…
60,000 Commandos Can’t Be Wrong- Musings From A Casual Blogger
By Dave Porter, Technical and Customer Support at The Bonneville Shop I have always admired the Norton Commando series of motorcycles, not…
Part 2: Resurrecting a Barn Bike: Hydraulic Brake Restoration (non-ABS)
Part 2: Resurrecting a Barn Bike: Hydraulic Brake Restoration (non-ABS) Triumph Hydraulic Brake Restoration By Mike Grage, Technical and Customer Support…
Constant Velocity Carburetor Cleaning/Tuning Tips & Tricks
…Triumph CV Carburetor Cleaning and Tuning FAQs How do I know if my Triumph’s carburetors need cleaning or rejetting? Why…
Part 1: Resurrecting a Ran-When-Parked, Barn Find, Carbureted Triumph from the Hinckley Factory
By Mike Grage, Technical and Customer Support at The Bonneville Shop and British Iron. When I started my career as a…
A Look at the Lucas 149SA and 47SA Ignition Switches
…Lucas 3 and 4-position ignition switches designated as 149SA and 47SA are very similar in design and appearance. Used extensively…
Matchless AJS and Associated Motor Cycles
By Dave Porter, Technical and Customer Support at The Bonneville Shop AMC Looking back on some of the more revered names…
The Conundrum of Triumph C-Range Top-End Compatibility
Triumph T100 Top End – The Conundrum of Triumph C-Range Top-End Compatibility Unfortunately, I have chosen to take on a…
Timing Tri-Spark Ignition – Classic Twin Ignition
…setting the timing. The Classic Twin Ignition is suitable for Triumph Unit Twins T100, T120, TR7RV, T140 Bonneville, Tiger, Daytona…
A Word About BSA, Norton, and Triumph Seat Supply
By Dave Porter, Technical and Customer Support at The Bonneville Shop If you have been searching for seat supply for…
A Look at the Mysterious Lucas Cutout/ Lucas Kill Switches
…– Kill Switch: 762080, 76200A, and 762204 The 4A cutout switch carried several Lucas part numbers, including Lucas kill switch…
Norton Motorcycle Photos
Norton motorcycle photos from our customers here at The Bonneville Shop. Check out or stock of parts for your Norton….
Gearbox Sprocket: Tips for a Grooved High Gear Spine and Chamfered Sprocket
From Guest Expert: Don Johnson To use an o ring with the gearbox sprocket you must have a high gear spline…
The Imperiled Life of the Kickstarter Cotter Pin
The Imperiled Life of the Kickstarter Cotter Pin One of the hallmarks of vintage BSA and Triumph motorcycles is the kickstart…
Year, Make, Model – What Are You Working on Today?
Triumph and BSA Frame and Engine NumbersWhere are the Frame and Engine Numbers?Registration and Title Documents for Year Make Model …
Setting Up Dual Carbs
By Dave Porter, Technical and Customer Support at The Bonneville Shop If you’re working on setting up dual carbs for your…
A Guide To Triumph Headlamp Shells
By Dave Porter, Technical and Customer Support at The Bonneville Shop Table of Contents for Triumph Headlamp ShellsLucas SS 700 7”Lucas…
Amal Carb Fitment: An Everyman’s Guide
It’s been said many times that nothing wakes up an old British motorcycle like a new carburetor. Amal carb…
A Bit About Fender Stays
A Bit About Fender Stays By Dave Porter, Technical and Customer Support at The Bonneville Shop “…there are many different configurations of…
Why Not A BSA?
By Dave Porter, Technical and Customer Support at The Bonneville Shop Barn Bikes Abound – BSA Motorcycles “…not only are they plentiful,…
The Case for the Parts Catalog as the Most Important Tool in the Cabinet
By Dave Porter, Technical and Customer Support at The Bonneville Shop Work Smarter, Not HarderAdvantages to a Printed Parts CatalogParts Catalog…
TECH TIP: How to Install New Clutch Rubbers
By Dave Porter, Technical and Customer Support at The Bonneville Shop Steps to Install New Clutch Rubbers Using a Clutch…
Sealing Washers and the Oil-Tight Triumph Engine
‘Sealing Washers and the Oil-Tight Triumph Engine’ By Dave Porter, Technical and Customer Support at The Bonneville Shop Fiber WashersCopper WashersStat-O-Seal…
Application Techniques for Waterslide Decals
By Dave Porter, Technical and Customer Support at The Bonneville Shop There are 4 basic steps on how to apply a…
Motorcycle Fender – Classic Triumph Fender – OEM and Custom Mudguards for Your Project Bike
A motorcycle fender will restore your classic Triumph to its true glory. Don’t put an old, compromised fender on your…
Triumph Service Bulletin Twin 9-70: Rotor/Rotor Nut
Loose Rotor Nut or Rotr Center: Triumph Service Bulletin Twin 9-70 By Dave Porter, Technical and Customer Support at The…
Winterizing Your Classic Brit Bike Checklist
Winterizing your classic Brit bike is one of the most important things you can do. For those of us living…
The Nuts and Bolts of Hardware
The Nuts and Bolts of Hardware By Dave Porter, Technical and Customer Support at The Bonneville Shop “…a factory parts catalog is…
How To Convert Your 6-Volt British Motorcycle to 12-Volts
…voltage regulator in place, and the speed which it can be spun. This is an oversimplification and there are other…
Get ‘em While They’re Hot- 130 Link 530 Chains!
130 Link 530 Chains By Dave Porter, Technical and Customer Support at The Bonneville Shop We recently procured a substantial quantity of…
VIDEO: Motorcycle Polish: Tips for Your Primary and Timing Cover
Motorcycle polish: yes or no? Did you just get your hands on a solid barn bike? How long was it…
Considerations for Your Brit Bike: A Brief Guide to Cables
…Triumph twin, and there is not enough inner wire free length for the original cable to let the slide drop…
Bearing Race Puller – Motorcycle Tools
Buy a bearing race puller today. If you’re doing any motorcycle restoration, having the right tools is essential. Bearings, including…
Fork Damper Sleeve Install – Which Way Do They Go?
By Dave Porter, Technical and Customer Support at The Bonneville Shop – For Triumph and BSA forks up to 1970 (up…
Triumph Top-End Sealing and What the Workshop Manual Doesn’t Explain
By Dave Porter, Technical and Customer Support at The Bonneville Shop Table of Contents for triumph top end sealingResourcesConsiderations For…
A Primary Concern: The B-Range Chaincase Covers
By Dave Porter, Customer and Technical Support at The Bonneville Shop Table of Contents Primary Chaincase Cover: 57-1727 Primary Chaincase…
The Importance of Right to Repair Legislation
By Mike Grage, Technical and Customer Support at The Bonneville Shop written in partnership with British Iron, our Modern Triumph…
A Guide for BSA and Triumph Oil Pressure Switch Identification
…to 70-8797 for the 1968 model year, perhaps due to the change in thread form of the contact breaker plate…
Pattern Parts and Fettling to Perfection
Pattern Parts and Fettling to Perfection By Dave Porter, Technical and Customer Support at The Bonneville Shop Occasionally I receive inquiries from…
Using LEDs with Traditional Turn Signal and High Beam Indicator Lights
By Mike Grage, Technical and Customer Support at The Bonneville Shop and British Iron. Power FlowPotential Problems with LED TroubleshootingLED Troubleshooting:…
Dave’s Building a 10-Footer: A 1970 Triumph TR6R Build – Part 2
By Dave Porter, Technical and Customer Support at The Bonneville Shop The 1970 Triumph TR6R Build Continues: Rotor and StatorPrimary Chaintiming…
Dave’s Building a 10-Footer: 1970 Triumph TR6R Repair – Part 1
By Dave Porter, Technical and Customer Support at The Bonneville Shop The 4th One – 1970 Triumph TR6R RepairFinding a Barn…
How the Tiger 100 Became the Triumph Daytona
By Dave Porter, Technical and Customer Support at The Bonneville Shop Doug Hele and the Daytona1967 – 1969 Triumph DaytonaThe end…
A Farewell to Real Chrome
By Mike Grage, Technical and Customer Support at The Bonneville Shop and British Iron. The Chrome of Before – Real ChromeLegislative…
Electronic Ignition System Diagnostics
By Mike Grage, Technical and Customer Support at The Bonneville Shop and British Iron. Function of Electronic Ignition SystemsTesting Functionality Here at…
Triumph Service Bulletin 64/1 – 1964 Forks – Eliminating Oil Leaks
1964 Forks – Eliminating Oil Leaks By Dave Porter, Technical and Customer Support at The Bonneville Shop One topic that comes up…
Easy Tri-Spark Triples Ignition Kit Installation Guide
By Mike Grage, Technical and Customer Support at The Bonneville Shop and British Iron. How to Wire it UpSetting the TimingTri-Spark…
Tips on Fitting the Girling Stainless Floating Brake Disc Rotor
By Dave Porter, Technical and Customer Support at The Bonneville Shop SpecsFitment ChallengesSolutions We have recently taken delivery and sold through our…
