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.
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Our Most Recent Tech Blogs
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
…an indication of a worn valve seat. If a valve has zero clearance you may want to pull the head…
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
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)
…using compressed air to pop pistons out of a floating caliper. There is nothing to stop them from shooting out…
Constant Velocity Carburetor Cleaning/Tuning Tips & Tricks
…master carburetor (center cylinder on triples, #3 on four cylinders). Turn the screw slowly in or out in small steps…
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 149SA 47SA Ignition Switches By Dave Porter, Technical and Customer Support at The Bonneville Shop Ignition Switches 47SA 3-Position…
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
…H27 illustration indicate the ignition cutout button, as specified for the TR6 and T120 models, however this combination was only…
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
…Sprockets 4 Speed and 5 Speed High Gear Nut Combo Spanner PN# TBS-0568 61-6061 61-6125 4-Speed High Gear Nut Socket…
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
…slumber and be ready to fire up when it’s time to emerge from hibernation. Table of Contents Fuel System Engine,…
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
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?
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
‘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
…The 446 LED head lamp bulbs have a similar problem in bikes with a main or high beam indicator light. …
Dave’s Building a 10-Footer: A 1970 Triumph TR6R Build – Part 2
…the transmission was installed, the inner gearbox cover is fitted. I prefer indexing the camplate in the high-gear position on…
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 Timing So,…
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
By Dave Porter, Technical and Customer Support at The Bonneville Shop Table of Contents 1930s BSA History 1940s BSA History…
