Panther Model 120
Encyclopedia
The Panther Model 120 was a British motorcycle
made between 1959 and 1966 by
Phelon & Moore
. An enlarged Panther Model 100
, the 120 had a reputation for being less reliable with a tendency for rapid clutch wear, problematical roller bearings and heavy oil consumption. As competitors produced modern designs, Panther ran into trouble obtaining supplies of Burman
gearboxes and Lucas Magdynos, so production ceased in 1966 and the company was wound up.
remained unchanged for 25 years and the 650 cc 'heavyweight' had many of the Model 100 components. The increased capacity was achieved by boring out the Model 100 cylinder by 1 mm and increasing the stroke by 6 mm. As well as increased low speed torque this improved acceleration and top end cruising speed.
This put additional strain on the main bearings and crankcases, leading to reliability problems. The 120 also suffered with lubrication problems from the large sump cast into the front of the engine. Oil was pumped to the top of the sloper engine but return was erratic and oil consumption very heavy. The main shaft was redesigned with larger ball journal main bearings, A smaller exhaust valve combined with a larger Amal monobloc carburettor gave the Model 120 28 bhp at 4500 rpm, an increase of 4 bhp over the Model 100.
Motorcycle sidecars were popular at the end of the 1950s, so the Model 120 was provided with a purpose built sidecar chassis, connected by a three point mounting which provided minimal alignment problems. The sidecar wheel was interchangeable with the motorcycle wheels and had swinging arm suspension with an Armstrong shock absorber. A trailer with a towbar was also provided as an option.
were in financial trouble and went into receivership. The Model 120 stayed in production for as long as the supply of spare parts lasted, but they finally ran out in 1966 and the company folded. It wasn't quite the end for the big Panther, however, as they were cheap and economical and continued to sell for another year after production ended. Panther Model 120's are still being maintained and used regularly to this day by enthusiasts.
Motorcycle
A motorcycle is a single-track, two-wheeled motor vehicle. Motorcycles vary considerably depending on the task for which they are designed, such as long distance travel, navigating congested urban traffic, cruising, sport and racing, or off-road conditions.Motorcycles are one of the most...
made between 1959 and 1966 by
Phelon & Moore
Phelon & Moore
Phelon & Moore manufactured motorcycles in Cleckheaton, Yorkshire, England from 1904 to 1967 particularly those under the Panther marque. They became identified with one particular design of motorcycle which had a large sloping 40-degree single-cylinder engine as a stressed front frame member...
. An enlarged Panther Model 100
Panther Model 100
The Panther Model 100 was a British motorcycle. It had a 598 cc, 6.5:1 compression ratio, , OHV sloper engine in a frame where the engine replaces the front down-tube. Panthers were manufactured in Cleckheaton, Yorkshire from 1900 to 1967. Launched in 1932, the Model 100 continued through to...
, the 120 had a reputation for being less reliable with a tendency for rapid clutch wear, problematical roller bearings and heavy oil consumption. As competitors produced modern designs, Panther ran into trouble obtaining supplies of Burman
Burman and Sons Ltd
Burman and Sons Ltd, of Ryland Road, Birmingham, England, manufactured Burman-Douglas steering gear.Their recirculating worm and ball design of steering gear was fitted to pre-war vehicles such as the Ford Eight and the Ford Prefect, the Bedford CA, plus many other vehicles - both pre and post-war....
gearboxes and Lucas Magdynos, so production ceased in 1966 and the company was wound up.
Development
The Panther sloper engine designed by Granville BradshawGranville Bradshaw
Granville Eastwood Bradshaw OBE, AFRAeS was an English engineer and inventor who designed motorcycle and aero-engines.-History:Bradshaw was born in Preston, Lancashire in 1887 as the son of William and Annie Bradshaw. His father was a jeweler and optician.Bradshaw's early work was involved with...
remained unchanged for 25 years and the 650 cc 'heavyweight' had many of the Model 100 components. The increased capacity was achieved by boring out the Model 100 cylinder by 1 mm and increasing the stroke by 6 mm. As well as increased low speed torque this improved acceleration and top end cruising speed.
This put additional strain on the main bearings and crankcases, leading to reliability problems. The 120 also suffered with lubrication problems from the large sump cast into the front of the engine. Oil was pumped to the top of the sloper engine but return was erratic and oil consumption very heavy. The main shaft was redesigned with larger ball journal main bearings, A smaller exhaust valve combined with a larger Amal monobloc carburettor gave the Model 120 28 bhp at 4500 rpm, an increase of 4 bhp over the Model 100.
Motorcycle sidecars were popular at the end of the 1950s, so the Model 120 was provided with a purpose built sidecar chassis, connected by a three point mounting which provided minimal alignment problems. The sidecar wheel was interchangeable with the motorcycle wheels and had swinging arm suspension with an Armstrong shock absorber. A trailer with a towbar was also provided as an option.
The end
By 1962 Phelon & MoorePhelon & Moore
Phelon & Moore manufactured motorcycles in Cleckheaton, Yorkshire, England from 1904 to 1967 particularly those under the Panther marque. They became identified with one particular design of motorcycle which had a large sloping 40-degree single-cylinder engine as a stressed front frame member...
were in financial trouble and went into receivership. The Model 120 stayed in production for as long as the supply of spare parts lasted, but they finally ran out in 1966 and the company folded. It wasn't quite the end for the big Panther, however, as they were cheap and economical and continued to sell for another year after production ended. Panther Model 120's are still being maintained and used regularly to this day by enthusiasts.