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Mike Grage, Technical and Customer Support at The Bonneville Shop and British Iron 446 LED Update for 2026 There have been a few changes to the parts that are available to us from when I first started working for The Bonneville Shop in July 2021. Back then I was tasked with providing a solution to […]
446 LED Update for 2026 Read More »
early 2AR Lucas 36403 ammeters By Dave Porter, Technical and Customer Support at The Bonneville Shop Lucas supplied the 2AR ammeter for use in Triumph 650 motorcycles from 1962 through 1970, specified for both the 6 and 12 volt charging systems. The early unit-construction coil ignition models were specified with the Lucas 36296 or
Fitting the Lucas 36403 Ammeter Read More »
Lucas 149SA 47SA Ignition Switches By Dave Porter, Technical and Customer Support at The Bonneville Shop The Lucas 3 and 4-position ignition switches designated as 149SA and 47SA are very similar in design and appearance. Used extensively in the 1960s and through the early 1980s, Lucas supplied the British automotive and motorcycle industries with
A Look at the Lucas 149SA and 47SA Ignition Switches Read More »
…setting the timing. The Classic Twin Ignition is suitable for Triumph Unit Twins T100, T120, TR7RV, T140 Bonneville, Tiger, Daytona etc; Norton Atlas and 1968 Commando; Enfield Interceptor (Clockwise Rotation);…
Timing Tri-Spark Ignition – Classic Twin Ignition Read More »
By Dave Porter, Technical and Customer Support at The Bonneville Shop The headlamp shell is one of the most prominently displayed parts on a vintage British motorcycle, as it sits proudly between the forks and in front of the handlebar. All too often, a project motorcycle is acquired with a dented, rusted, or incorrectly fitted
A Guide To Triumph Headlamp Shells Read More »
Loose Rotor Nut or Rotr Center: Triumph Service Bulletin Twin 9-70 By Dave Porter, Technical and Customer Support at The Bonneville Shop “When the rotor has been in service for many years, the magnetism can decline, which leads to weaker output from the alternator.” This Triumph service bulletin, released September 2, 1970, was a reminder
Triumph Service Bulletin Twin 9-70: Rotor/Rotor Nut Read More »
By Dave Porter, Technical and Customer Support at The Bonneville Shop Converting Your 6-volt British Motorcycle to 12-volts can be a bit of work.“The conversion requires not just an upgrade of charging system components, but also auxiliary electrical components. This includes light bulbs, horn, fuses, and in some cases, switches, ignitions, and ignition coils.”
How To Convert Your 6-Volt British Motorcycle to 12-Volts Read More »
By Mike Grage, Technical and Customer Support at The Bonneville Shop and British Iron. LED Troubleshooting – We didn’t have LEDs when I started professionally wrenching on motorcycles over 30 years ago, but I most certainly wish we did due to the low power requirements. Done right LED lighting can make riding a battery less
Using LEDs with Traditional Turn Signal and High Beam Indicator Lights Read More »
The Back Story During the late 1960s, the BSA Group was busy developing the next generation of Triumph and BSA motorcycles at a leased 17th-century mansion in Warwickshire, known as Umberslade Hall. Situated nearly equidistant from Redditch, Small Heath, and Meriden, the research and development facility was the epicenter for the design teams to update
A Brief Synopsis of the Lucas Console Switchgear and Its Evolution Read More »
…diodes in the rectifier are check valves/back flow preventers. I’m going to keep this article about the 12V systems used in British motorcycles in an effort to keep as simple…
12 Volt Charging System Diagnostic Guide Read More »