Tech Blog
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.
To Return to the Home page, Click Here.
Our Most Recent Tech Blogs
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 2AR…
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
…Isolastic kit allows for retrofit to the earlier pre-MK3 models. The 06-7117 rear kit is a direct replacement for the…
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
By Mike Grage, Technical and Customer Support at The Bonneville Shop and British Iron. Carb Cleaning and TuningFloat Bowl/Fuel System Ventilation:Float…
Part 1: Resurrecting a Ran-When-Parked, Barn Find, Carbureted Triumph from the Hinckley Factory
…battery and turn the key on and make sure the dash is lighting up and everything is working, give the…
A Look at the Lucas 149SA and 47SA Ignition Switches
…engage the starter solenoid. When the engine starts, the key is released and returns to the first detent. There are…
Matchless AJS and Associated Motor Cycles
…well known for their venerable G3 single-cylinder military dispatch model, which would continue production as a civilian model after the…
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
…TR6C, T120C, and T120TT competition models, as well as the BSA A50W and A65H models 1966-1967. The black hard plastic…
Norton Motorcycle Photos
…Norton Commando Joe – A 73 Norton Commando he saved from a Chopper Alan’s Norton 850 Commando Alan’s Norton 850…
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
…over the engine to initiate starting. In most cases, the transmission is engaged by the action of the kickstarting lever,…
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
…and spigot nut are all in serviceable condition for the rotor to perform its job of revolving inside of 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
…on post-war machines: British Standard Whitworth (BSW) British Standard Whitworth (BSW) is a coarse thread with a 55 degree included…
How To Convert Your 6-Volt British Motorcycle to 12-Volts
By Dave Porter, Technical and Customer Support at The Bonneville Shop Converting Your 6-volt British Motorcycle to 12-volts can be a…
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
By Dave Porter, Technical and Customer Support at The Bonneville Shop A Guide to CablesThrottle cablesClutch CablesBrake Cables As a customer service…
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?
…over the many fork tools that we carry including the 1.5 inch fork top nut spanner, the billet fork nut…
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
…is what is currently available in the marketplace, so be aware that the 1976-1980 models may require some modification to…
The Importance of Right to Repair Legislation
…work on their motorcycles or cars. Some state governments like Nevada will not provide vehicle owners with the data from…
A Guide for BSA and Triumph Oil Pressure Switch Identification
‘A Guide for BSA and Triumph Oil Pressure Switch Identification’ By Dave Porter, Technical and Customer Support at The Bonneville Shop The…
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
…and knowledge levels tend to have difficulty making LED turn signal lights work on their motorcycles, this is usually due…
Dave’s Building a 10-Footer: A 1970 Triumph TR6R Build – Part 2
…The 1970 Triumph TR6R Build Continues: Rotor and Stator Next in the series shows me checking the air gap of…
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
…bands”. The end of the Classic Triumph Daytona The T100R Triumph Daytona models are one the most tractable and beloved…
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
…spark plug lead with spark plug caps off. A no spark condition is generally caused by bad coils which is…
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
…the installation/tuning process. Tri-Spark provides excellent instructions for setting the timing, both statically and dynamically. Of course, there is one…
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…
Thunderbolts and Lightning: BSA Motorbikes
BSA Motorcycles: Thunderbolts and Lightning, very, very frightening me! (Galileo) Galileo (Galileo) Galileo… By Dave Porter, Technical and Customer Support at The…
TECH TIPS – Evaluating Your Clutch Plates and Springs
By Dave Porter, Technical and Customer Support at The Bonneville Shop How do I know if my clutch plates need replacing? Check…
