MotoGP Motorcycle Sale 2011

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1970 Triumph T120 Boneville 650

Lot No.: 10

Registration: GWT 52 J
Frame Number: T120/JD 58987
Side Car: No
Engine Number: Triumph JB 58987 T 120
Number of cylinders: 2
CC: 650
Year of Manufacture: 1970
Sold for (£): Result to follow


The original Triumph Bonneville was a 650 cc parallel-twin (two-cylinder) motorcycle manufactured by Triumph Engineering and later by Norton Villiers Triumph between 1959 and 1974. It was based on the company's Triumph Tiger T110 and was fitted with that bike's twin 1 and 3/16 inch Amal monobloc carburettors as standard, along with that model's high-performance inlet camshaft. It was initially produced with a pre-unit construction engine which enabled the bike to comfortably achieve 115 mph without further modification. Later a unit construction model was introduced which was stiffer and more compact, including additional bracing at the steering head and swing arm. The steering angle was altered and improved forks were fitted a couple of years later, which, together with this increased stiffness enabled overall performance to match that of the Bonneville's rivals. Later T120 Bonnevilles used a new frame which contained the engine oil instead of using a separate tank; this became known as the oil in frame version. The T120 engine, both in standard configuration and especially when tuned for increased performance, was popular in café racers such as Tribsas and particularly Tritons.

The work that has been put into this 1970 T 120 Bonney 650 truly beggars belief. The engine has been totally stripped and restored, maintaining the standard crank and bores, but featuring all new bearings in both the engine and gear box, as well as a brand new clutch and primary chain; valve guides and springs and a brand new pair of carburettors and control cables. The standard of work on this bike is exemplary, it shows the hours of labour that have been lavished upon it. As far as the cycle parts are concerned, the wheels have been treated to new rims and spokes; there are brand new tyres and tubes and a pair of new rear shocks. The seat is "new old stock" and the chromium plated exhaust system is also a brand new item. The forks have been fully reconditioned and a new rear chain has been fitted. Along with these improvements and restorations, the bike features a popular mod to Phazor ignition, allied to a three phase alternator governed by a regulator/rectifier. There is a brand new IG switch and wiring harness mated to a dual coil and IG coil pack. In short, with only 22,891 miles on the clock this must surely be one of the ultimate Triumph 650 Bonnevilles in existence.