Tech Blog

Mike Grage, Technical and Customer Support at The Bonneville Shop and British Iron 446 LED Update for 2026 There have been a…

Dave Porter, Technical and Customer Support at The Bonneville Shop. Motorcycle Wheel Building     One of the more satisfying elements of the…

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 By Dave Porter, Technical and Customer Support at The Bonneville Shop …

Hinckley Triumph Maintenance and Restoration Part 3: Resurrecting A Barn Find Hinckley By Mike Grage, Technical and Customer Support at The…

early 2AR Lucas 36403 ammeters By Dave Porter, Technical and Customer Support at The Bonneville Shop      Lucas supplied the 2AR…

Triumph T140 Rear Rim Retrofit and Service Bulletin 4-77 By Dave Porter, Technical and Customer Support at The Bonneville Shop Triumph T140…

By Dave Porter, Technical and Customer Support at The Bonneville Shop      In this blog I will cover some information regarding…

By Dave Porter, Technical and Customer Support at The Bonneville Shop I have always admired the Norton Commando series of motorcycles, not…

…cleaned and flushed if the reservoir was filled with dried up brake fluid. The process is rather simple whether it’s…

By Mike Grage, Technical and Customer Support at The Bonneville Shop and British Iron. Carb Cleaning and TuningFloat Bowl/Fuel System Ventilation:Float…

…the cleaning process. The first item on the list is the fuel tank and petcock. Be sure to use a…

Lucas 149SA 47SA Ignition Switches By Dave Porter, Technical and Customer Support at The Bonneville Shop Ignition Switches47SA 3-Position Ignition Switch149SA 4-Position…

By Dave Porter, Technical and Customer Support at The Bonneville Shop AMC      Looking back on some of the more revered names…

By Dave Porter, Technical and Customer Support at The Bonneville Shop      Triumph T100 Top End – The Conundrum of…

…setting the timing. The Classic Twin Ignition is suitable for Triumph Unit Twins T100, T120, TR7RV, T140 Bonneville, Tiger, Daytona…

By Dave Porter, Technical and Customer Support at The Bonneville Shop     If you have been searching for seat supply for…

Lucas Kill Switches and Cutouts By Dave Porter, Technical and Customer Support at The Bonneville Shop 4A Cutout – Kill Switch: 762080,…

Norton motorcycle photos from our customers here at The Bonneville Shop. Check out or stock of parts for your Norton….

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 One of the hallmarks of vintage BSA and Triumph motorcycles is the kickstart…

Triumph and BSA Frame and Engine NumbersWhere are the Frame and Engine Numbers?Registration and Title Documents for Year Make Model    …

…gauges for the final tweaks. But it is good enough to be used on its own if done carefully. Setting…

…specification Triumph 500 and 650 models with 12 volt battery. Ammeter and grommet hole. 5/16-26 CEI bolt holes. 59579S (99-9971A)…

    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 By Dave Porter, Technical and Customer Support at The Bonneville Shop “…there are many different configurations of…

   By Dave Porter, Technical and Customer Support at The Bonneville Shop Barn Bikes Abound – BSA Motorcycles “…not only are they plentiful,…

By Dave Porter, Technical and Customer Support at The Bonneville Shop Work Smarter, Not HarderAdvantages to a Printed Parts CatalogParts Catalog…

By Dave Porter, Technical and Customer Support at The Bonneville Shop Steps to Install New Clutch RubbersUsing a Clutch Locking ToolThe…

…of their sealing properties due to distortion. Stat-O-Seal and Dowty Washers Stat-O-Seal and Dowty washers are a metal washer with…

By Dave Porter, Technical and Customer Support at The Bonneville Shop There are 4 basic steps on how to apply a…

A motorcycle fender will restore your classic Triumph to its true glory. Don’t put an old, compromised fender on your…

…and spigot nut are all in serviceable condition for the rotor to perform its job of revolving inside of the…

…idle in the garage for the past few months. An hour of working on the motorcycle to get a mere…

The Nuts and Bolts of Hardware By Dave Porter, Technical and Customer Support at The Bonneville Shop “…a factory parts catalog is…

…4CA points ignition system, a more powerful stator should be considered. The Lucas 47205 RM21 is a 10-amp single-phase stator…

130 Link 530 Chains By Dave Porter, Technical and Customer Support at The Bonneville Shop   We recently procured a substantial quantity of…

Motorcycle polish: yes or no? Did you just get your hands on a solid barn bike? How long was it…

…for handlebar fitment depending on the intended market the motorcycle was produced for. Most Home-market (UK-spec) models were fitted with…

Buy a bearing race puller today. If you’re doing any motorcycle restoration, having the right tools is essential. Bearings, including…

By Dave Porter, Technical and Customer Support at The Bonneville Shop – For Triumph and BSA forks up to 1970 (up…

By Dave Porter, Technical and Customer Support at The Bonneville Shop Table of Contents for triumph top end sealing Resources…

By Dave Porter, Customer and Technical Support at The Bonneville Shop Table of Contents Primary Chaincase Cover: 57-1727 Primary Chaincase…

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’ By Dave Porter, Technical and Customer Support at The Bonneville Shop The…

Pattern Parts and Fettling to Perfection By Dave Porter, Technical and Customer Support at The Bonneville Shop Occasionally I receive inquiries from…

By Mike Grage, Technical and Customer Support at The Bonneville Shop and British Iron. Power FlowPotential Problems with LED TroubleshootingLED Troubleshooting:…

…The 1970 Triumph TR6R Build Continues: Rotor and Stator Next in the series shows me checking the air gap of…

By Dave Porter, Technical and Customer Support at The Bonneville Shop The 4th One – 1970 Triumph TR6R RepairFinding a Barn…

…bands”. The end of the Classic Triumph Daytona The T100R Triumph Daytona models are one the most tractable and beloved…

By Mike Grage, Technical and Customer Support at The Bonneville Shop and British Iron. The Chrome of Before – Real ChromeLegislative…

…camshaft. Connect the wires to the stator plate. Turn on ignition switch. Hold the stator plate in one hand. Use…

…specified for the Triumph twins through the 1966 model year and still required thread sealant if it was expected to…

…the installation/tuning process. Tri-Spark provides excellent instructions for setting the timing, both statically and dynamically. Of course, there is one…

By Dave Porter, Technical and Customer Support at The Bonneville Shop SpecsFitment ChallengesSolutions We have recently taken delivery and sold through our…

BSA Motorcycles: Thunderbolts and Lightning, very, very frightening me! (Galileo) Galileo (Galileo) Galileo… By Dave Porter, Technical and Customer Support at The…

By Dave Porter, Technical and Customer Support at The Bonneville Shop Clutch Plates AND Springs Clutch Plates When evaluating the clutch plates and…

…Sourcing Parts History of the 1978 Triumph Bonneville As any experienced Triumph parts expert will tell you, the 1978 Triumph…

…until the valve is lifted .040 (Triumph’s spec is to set valve clearance to .020) and write down the reading…

UK made fenders from Speedwell Mudguards uses the original tooling and machines to replicate OEM length, width, radius and even…