…and valves to produce the sequence of valvetrain function in the Triumph twin engines. In the beginning, when the first 650cc Triumph model was introduced in 1950, the 6T used…
The Brain of Your Triumph B Range Engine- the Camshaft 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 »
By Dave Porter, Technical and Customer Support at The Bonneville Shop Installation Instructions When using our TBS-0041 layshaft bearing drift tool, be sure to place the 57-1607 thrust washer on the locating peg in the gearbox housing, as it sets the depth of the closed-end 57-1606 layshaft needle bearing. I like
TECH TIPS – Layshaft Needle Bearing Installation Tool Read More »
…the forthcoming 1970 model year, which also saw the introduction of the thick 70-9711 carburetor flange O-ring, and the omission of the 70-2968 phenolic spacer on the T120R models. The…
Carburetor Mounting Orings: 622/101 Thin vs 70-9711 Thick Read More »
Custom Motorcycle Cable From time to time, we encounter an inquiry for a throttle or choke cable that is not available as pre-manufactured by our suppliers. There can be a number of reasons for non-standard fitment of cables, such as a change in handlebar height or width, the use of an aftermarket throttle twist-grip, or
Creating a Custom Motorcycle Cable Read More »
By Dave Porter, Technical and Customer 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 »
Table of Contents Background Service Bulletin 10-69 Amal Concentric Carbs – Parts Background On May 1, 1969, Triumph published Service Bulletin Number 10-69, pertaining to the Amal Concentric carbs. The…
Triumph Service Bulletin 10-69 – Amal Concentric Carbs Read More »
Wear limits of parts on 50, 60, 70 year old bikes should be top of mind. One of many considerations the restorer or engine builder is faced with is whether a part or assembly is rubbish or can be put back into service. Wear limits factors include a preference to retain originality, taking advantage of
Wear Limits on Measured Parts & the “Nicholson’s Specifications” Read More »