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Loose Rotor Nut or Rotr Center: Triumph Service Bulletin Twin 9-70 Dave Porter, Customer and Tech 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 to […]
Triumph Service Bulletin Twin 9-70: Rotor/Rotor Nut Read More »
By Dave Porter, Customer and Technical Support at The Bonneville Shop It was brought to my attention recently while updating Triumph 500 valve product descriptions in our catalog, that there should be a blog to help illustrate some of the history and evolution of the mighty Daytona Tiger 100. Bert Hopwood and Harry Sturgeon were
How the Tiger 100 Became the Triumph Daytona Read More »
1964 Forks – Eliminating Oil Leaks By David Porter, Customer and Technical Support at The Bonneville Shop One topic that comes up occasionally when discussing the early unit-construction Triumph B and C-range telescopic forks is the fork oil seal holders, or “dust excluder sleeve nuts”, as termed in the Triumph parts catalogs. The new external
Triumph Service Bulletin 64/1 – 1964 Forks – Eliminating Oil Leaks Read More »
By David Porter, Customer and Technical Support at The Bonneville Shop From time to time, we receive reports from customers working on piston ring replacements on their Triumph engines and the measured ring end-gaps appear to be out of specification. There can be several reasons for this perception. Sometimes, the technician performing the job simply
Triumph Service Bulletin 11/71 – Piston Ring Replacement Read More »
Background Service Bulletin 4/72 focused on the hydraulic disc brake and was published 10/24/72. Around the time that the Lockheed hydraulic disc brakes debuted on the new Triumph 750cc models: TR7RV, T140V, and T150V. This bulletin seems to have preceded the 1973 Triumph Factory Workshop Manual, 99-0983, and was of significant importance, as the new
Triumph Service Bulletin 4/72 – Servicing the Hydraulic Disc Brake Read More »
Having trouble fitting Triumph parts to your vintage bike? This interesting Triumph Service Bulletin, issued on 11/9/1973, seems to confirm what many of us have known all along- sometimes you have to massage parts to make them fit correctly, or slightly modify them to improve fitment. Pattern parts originate from all over the globe and
Tech Tip – Fettling with your Vintage Brit Bike Read More »
Background On May 1, 1969, Triumph published Service Bulletin Number 10-69, pertaining to the Amal Concentric carbs. The bulletin, which appears to have been influenced by the West Coast Triumph distributor, Johnson Motors, explains the changes made to the late 1968 and 1969 Triumph models to enhance engine performance in the 1968 models which were
Triumph Service Bulletin 10-69 – Amal Concentric Carbs Read More »
By David Porter, Customer and Technical Support at The Bonneville Shop Is countershaft sealing the issue? We are often times confronted with mysterious leaks and are confounded by trying to establish the origin of the misplaced oil. Triumph issued a service bulletin in 1973 pertaining to a leak occurring through the splines on
Countershaft Sealing Read More »