Photo: Bring A Trailer
The amount of work that’s been put into reconditioning this treasure is quite bewildering.
Triumph’s 1978 MY Bonneville T140 is put in motion thanks to an air-cooled 744cc parallel-twin powerplant, which packs a compression ratio of 7.9:1 and two Amal carburetors with 30 mm (1.2 inches) throttle bodies. The four-stroke mill is capable of achieving a peak horsepower figure of 49 ponies when the tachometer reaches optimal rpm.
A five-speed constant-mesh transmission is tasked with enabling the engine’s force to reach the rear wheel by means of a chain final drive, resulting in a top speed of 110 mph (176 kph). At the front, Bonnie sits on a pair of telescopic forks, while rear suspension duties are carried out by dual shock absorbers.
The front hoop is brought to a halt by a single brake disc and a two-piston hydraulic caliper, accompanied by an identical setup on the opposite end. Triumph’s iconic machine will tip the scales at 395 pounds (180 kg) before receiving any of the necessary fluids. Finally, its wheelbase measures 54.5 inches (1,403 mm).
As you browse this article’s photo gallery, you’ll see a reconditioned ‘78 Bonneville T140 that’s heading to the auction block at no reserve. This whole shebang is taking place on Bring A Trailer, where you can submit your bids until Monday, June 28. For the time being, the top bidder is offering $5,100 to get their hands on this timeless piece of British motorcycling history.
Before you make your way to the BaT platform, we invite you to join us for a quick inspection of the restoration work that’s gone into this pristine two-wheeler. For starters, the original gas tank has been deleted to make room for a 1979 T140D’s item, while the bike’s frame was powder-coated from head to toe. Additionally, Bonnie’s forks, brakes and wheels have all been rebuilt to bring about a considerable improvement in the handling department.
At the rear, the standard shocks were removed in favor of higher-spec suspension goodies. In terms of powertrain upgrades, the twin-cylinder fiend features new piston rings, seals and gaskets, as well as a modern battery and fresh clutch plates. A set of aftermarket mufflers help the engine breathe with ease, assisted by top-shelf air filters on the intake end of the combustion cycle.
A five-speed constant-mesh transmission is tasked with enabling the engine’s force to reach the rear wheel by means of a chain final drive, resulting in a top speed of 110 mph (176 kph). At the front, Bonnie sits on a pair of telescopic forks, while rear suspension duties are carried out by dual shock absorbers.
The front hoop is brought to a halt by a single brake disc and a two-piston hydraulic caliper, accompanied by an identical setup on the opposite end. Triumph’s iconic machine will tip the scales at 395 pounds (180 kg) before receiving any of the necessary fluids. Finally, its wheelbase measures 54.5 inches (1,403 mm).
As you browse this article’s photo gallery, you’ll see a reconditioned ‘78 Bonneville T140 that’s heading to the auction block at no reserve. This whole shebang is taking place on Bring A Trailer, where you can submit your bids until Monday, June 28. For the time being, the top bidder is offering $5,100 to get their hands on this timeless piece of British motorcycling history.
Before you make your way to the BaT platform, we invite you to join us for a quick inspection of the restoration work that’s gone into this pristine two-wheeler. For starters, the original gas tank has been deleted to make room for a 1979 T140D’s item, while the bike’s frame was powder-coated from head to toe. Additionally, Bonnie’s forks, brakes and wheels have all been rebuilt to bring about a considerable improvement in the handling department.
At the rear, the standard shocks were removed in favor of higher-spec suspension goodies. In terms of powertrain upgrades, the twin-cylinder fiend features new piston rings, seals and gaskets, as well as a modern battery and fresh clutch plates. A set of aftermarket mufflers help the engine breathe with ease, assisted by top-shelf air filters on the intake end of the combustion cycle.
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