 1953 MV Agusta 125 Bialbero | |
| Manufacturer | MV Agusta |
|---|---|
| Production | 1950–1960 |
| Class | Factory racer |
| Engine | 125 cc Four-stroke DOHC single-cylinder |
The MV Agusta 125 Bialbero was a 125 cc factory racer from the Italian brand MV Agusta, which was used between 1950 and 1960. [1] The machine won 34 GPs, 6 rider's championships and one manufacturer's championship. [2] The machine also won 4 Italian Championships and 10 National Championships in other countries. [3]
Agusta was an Italian helicopter manufacturer. It was based in Samarate, Northern Italy. The company was founded by Count Giovanni Agusta in 1923, who flew his first airplane in 1907. The MV Agusta motorcycle manufacturer began as an offshoot of the Agusta aviation company at the end of the Second World War as a means to save the jobs of employees of the Agusta firm. [4]
As a hobby of the director, Count Domenico Agusta, the company entered motorcycle racing. It began in the popular Italian lightweight classes, and the first race bike was a 125cc two-stroke with a power output of 8 hp and a top speed of 115 km/h. In 1949, the engine delivered around 10 hp with a top speed of 130 km/h, but even in the national races in Italy, it was unable to compete with the fast four-strokes of Mondial and Moto Morini. [5] In 1949, Count Agusta employed Piero Remor and Arturo Magni, who had worked for Gilera until that time, and were responsible for the four-cylinder Gilera 500 4C. Remor brought great knowledge of the Gilera with it, and MV Agusta was able to profit well in the development of the MV Agusta 500 4C, but the first assignment for Remor was to make a 125 cc four-stroke engine. [5]
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The name "Bialbero" means "two camshafts". It was clear at that time that the lightweight models would need two camshafts. The MV Agusta Bialbero 125 engine even resembled the Benelli 250 cc racer from before the Second World War.
The engine was an air-cooled single-cylinder four-stroke with double overhead camshafts (DOHC) powered by a gear train. The valves were at an angle of 90° to each other and were closed by external hairpin springs. The valve diameter of the final model in 1960 was 34 mm for the inlet and 32 mm for the exhaust. The bore and stroke was 53 × 56 mm and the displacement 123.54 cc. These sizes corresponded to those of the Mondial 125 Bialbero and not, as one would expect, the Gilera 500 4C. In 1960 the compression ratio was 11:1. The oil tank of the dry sump system was initially in the conventional location under the tank, but was moved to the front part of the petrol tank in the mid-1950s. The ignition was provided by a magneto until 1954, but from 1955 double ignition coils were used, with a rocker switch to switch from one to the other. The power increased from around 12 hp in 1950 to around 20 hp in 1960.
The Dry multi-plate clutch was driven by gears from the crankshaft. There was initially a four-speed gearbox, but in 1955 the number of gears was expanded to seven. The rear wheel was driven by a chain.
The MV Agusta had a double cradle frame that was constructed from chrome molybdenum tubes with a diameter of 25 × 1.2 mm. Initially there were girder forks and sometimes Earles forks, but on later versions telescopic forks were used. At the rear there was a swinging arm with friction dampers, but these were replaced around 1954 by normal spring/damper elements with hydraulic shock absorbers.
| MV Agusta 125 Bialbero | 1950 | 1951 | 1952 | 1953 | 1954 | 1955 | 1956 | 1957 | 1958 | 1959 | 1960 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Valvetrain | DOHC with two valves per cylinder | ||||||||||
| Engine configuration | Four-stroke single-cylinder | ||||||||||
| Engine cooling | Air cooling | ||||||||||
| Bore | 52 mm | 53 mm | |||||||||
| Stroke | 58 mm | 56 mm | |||||||||
| Engine displacement | 123,2 cc | 123,5 cc | |||||||||
| Compression ratio | Unknown | 11:1 | |||||||||
| Lubrication system | Dry sump | ||||||||||
| Max power | 12 bhp (8.9 kW) @ 12.000 rpm | Unknown | 15 bhp (11 kW) @ 10.800 rpm | Unknown | 18.5 bhp (13.8 kW) @ 12.000 rpm | Unknown | 20 bhp (15 kW) @ 12.000 rpm | ||||
| Top speed | Unknown | 90 mph (140 km/h) | Unknown | 115 mph (185 km/h) | Unknown | 120 mph (190 km/h) | |||||
| Primary drive | Gear | ||||||||||
| Clutch | Dry multi-plate | ||||||||||
| Gears | 4 | 5 | 7 | ||||||||
| Final drive | Chain drive | ||||||||||
| Frame | Double cradle | ||||||||||
| Front forks | Girder forks | Earles forks or Telescopic forks | Telescopic forks | ||||||||
| Rear suspension | Swinging arm with friction dampers | Unknown | Swinging arm with hydraulic shock absorbers | ||||||||
| Brakes | Drum brakes | ||||||||||
| Dry weight | Unknown | 76 kg | Unknown | 80 kg | |||||||
Design of the new machine starts. [3]
The machine debuts at the Dutch GP in July. [6]
In 1951, Leslie Graham used the machine in two races. He dropped out of the Ultra Lightweight IOM TT and finished third at the Dutch TT as Assen. [7] He finished eighth in the 125 cc World Championship. [8]
Graham was to concentrate on the 500 cc class in 1951. Domenico Agusta decided that he needed British drivers for the World Championship, as they would know the Mountain Course at the Isle of Man and the Clady Circuit in Northern Ireland, and signed Cecil Sandford for the 125 cc class. [9] Sandford was still young and inexperienced in World Championship races, but had been riding in the Isle of Man since 1948; in the Clubmans Junior TT, the Manx Grand Prix, the Senior TT and the Junior TT. [10]
Sandford won the Ultra-Lightweight TT, the Assen TT and the Ulster Grand Prix and finished third in Germany and Spain. Sandford had set a new lap record at the Isle of Man. [9] The 1952 machine weighed only 76 kg and output had been increased to 15 bhp. Sandford won the 125 cc World Championship [11] and MV Agusta the Constructors Championship. [12]
In 1953, MV Agusta supplied a simpler version of the 125 cc racer, the MV Agusta 125 Monoalbero with only one overhead camshaft for private drivers. [13] That machine immediately became popular, meaning that no fewer than eleven MVs were at the start of the Isle of Man TT. [6] Les Graham won the Lightweight 125 cc TT on the Island, but in the Senior TT, he lost control of his bike at high speed, as he took the rise after the bottom of Bray Hill, and was killed instantly. [14] Sandford finished third and Carlo Ubbiali, who joined MV from Mondial, retired from the race. [15] Ubbiali won in Germany, [16] and Angelo Copeta, on an MV, won the final race of the season in Spain. [17] Sandford, Ubbiali, Copeta and Graham finished the season second, third, four and fifth in the World Championship. [18] MV Agusta again won the constructor's title. [12]
The NSU Rennfox was unbeatable in the hands of Rupert Hollaus in 1954 Grand Prix motorcycle racing season. [6] Hollaus won the first four GPs. [19] Carlo Ubbiali was second in the Lightweight 125 cc TT, but dropped out in the Ulster Grand Prix. [16] When Hollaus died during practice for the Nations motorcycle Grand Prix in Monza, NSU withdrew from racing. [20] In Monza, Ubbiali finished third [16] and those four points were enough to gain second place in the world championship. [21]
After the loss of NSU, MV Agusta were able to dominate the 125 cc class in 1955. MV won all of the GPs that season. Luigi Taveri won the season opener in Spain, and Ubbiali the remainder. [22] The first three places in the world championship were for MV riders: Ubbiali, Taveri and Remo Venturi, [23] and MV won the manufacturers title. [12]
An over-bored version of the machine, the MV Agusta 175 Bialbero, was produced for use in the Italian 175 cc Championship, a popular series at the time. [24]
MV Agusta faced stiffer competition in the 1956 season. The new Gilera 125 GP, on which Romolo Ferri regularly put in strong performances, and also the Mondial 125 Bialbero with the rising star Tarquinio Provini. [6] Ubbiali won five of the six GPs [6] and became Champion, teammates Taveri and Fortunato Libanori finished third and fifth. [25] MV again won the constructor's title. [12]
The Mondial had been developed to produce 18 bhp in 1957, [26] but Ubbiali started the season well with a victory at the Hockenheimring, [16] however, the fastest lap was set by Mondial driver Provini. [26] In the following three GPs (Ultra-Lightweight TT, Dutch TT and Belgian GP) Provini won. [27] Taveri won in Ulster and Ubbiali at Monza. [16] Ubbiali finished second in the Championship and Taveri third. [28]
At the end of 1957 the major Italian brands Gilera, FB Mondial, Moto Guzzi and MV Agusta announced that they would end racing activities. The high costs were not in proportion to sales and the sport had become far too expensive. [29] Count Agusta however reversed this decision and continued racing activities. For the 1958 season, the MV Agusta the 125 cc riders were Carlo Ubbiali and Tarquinio Provini. Ducati had entered the class with Alberto Gandossi and Luigi Taveri. [6]
Ubbiali won the Lightweight TT and at Assen. [16] The first win for the Ducati came at Spa. [30] Following a win in Germany for Ubbiali, [16] Ducati brought a new machine for the Swedish GP. Fabio Taglioni had built a fast four-stroke single-cylinder engine with three overhead camshafts. The third camshaft was needed for the desmodromic valve control. [31] The 125 Desmo Ducati was an immediate success: the young rider Alberto Gandossi won comfortably. [30] Gandossi fell at Ulster, allowing Ubbiali to win. [16] Bruno Spaggiari, on a Ducati, took victory in the final round at Monza. [32] Ubbiali won the Championship, with Provini forth. MV won the constructor's title. [12]
MV Agusta dominated the 1959 season. Provini won in the Isle of Man and Sweden. [27] Ubbiali won in Germany, Assen and Spa. [16] This was enough for Ubbiali to win the title, so the team did not travel to the Ulster Grand Prix. MV Agusta would have liked to win in the home race in Monza, but Ernst Degner very surprisingly won on the MZ RE 125 with a two-stroke engine. [33] Ubbiali won the title, Provini was second, [34] and again MV won the constructor's title. [12]
Honda entered the 125 cc for the 1960 season. [35] The MV Agusta 125 Bialbero now delivered 20 bhp and reached a top speed of 120 mph (200 kmh), but the Honda RC143 delivered 23 bhp. It had a two-cylinder engine that was rapidly developed, [35] but was still slower than the MV Agusta and the MZ RE 125. [36] Ubbiali won four of the five GPs [16] and was crowned champion, with teammate Gary Hocking second. [37]
1960 was the final year for the MV Agusta 125 Bialbero. The cost of racing for MV Agusta had become very high: A lot of money was invested in the 350 and 500 cc racers. Agusta decided not to compete in the 125cc class again.
MV Agusta is a high end motorcycle manufacturer founded by Count Domenico Agusta on 19 January 1945 as one of the branches of the Agusta aircraft company near Milan in Cascina Costa, Italy. The abbreviation MV stands for Meccanica (mechanics) Verghera, the hamlet where the first MVs were made. The modern headquarters and main production facilities are located in Varese, Italy on the shore of Lake Varese.
FB Mondial is a motorcycle manufacturer, founded in 1929, in Milan, Italy. They are best known for their domination of Motorcycle World Championships between 1949 and 1957. The firm produced some of the most advanced and successful Grand Prix road racers of the time, winning five rider and five manufacturer World Championships in that short period.
Phillip William Read, was an English professional motorcycle racer. He competed in Grand Prix motorcycle racing from 1961 to 1976. Read is notable for being the first competitor to win world championships in the 125 cc, 250 cc and 500 cc classes. Although he was often overshadowed by his contemporary, Mike Hailwood, he won seven FIM Grand Prix road racing world championships.
Carlo Ubbiali was an Italian nine-time World Champion motorcycle road racer. In the 1950s, he was a dominant force in the smaller classes of Grand Prix motorcycle racing, winning six 125cc and three 250cc world titles. In 2001, the F.I.M. inducted Ubbiali into the MotoGP Hall of Fame.
The 1958 Grand Prix motorcycle racing season was the tenth F.I.M. Road Racing World Championship Grand Prix season. The season consisted of seven Grand Prix races in five classes: 500cc, 350cc, 250cc, 125cc and Sidecars 500cc. It began on 6 June, with Isle of Man TT and ended with Nations Grand Prix in Italy on 14 September.
Robert Leslie Graham was a British motorcycle road racer who competed in the 1930s and 1940s. He won the inaugural Grand Prix motorcycle racing 500 cc World Championship in 1949.
Luigi Taveri was a Swiss professional Grand Prix motorcycle road racer. He competed in the FIM motorcycle Grand Prix world championships from 1954 to 1966. Taveri is notable for being a three-time 125cc road racing world champion. Although he specialised in the smaller engined machines, Taveri is the only competitor to have scored points in six Grand Prix classes: 50cc, 125cc, 250cc, 350cc, 500cc and Sidecars. In 2016, he was named an FIM Legend for his motorcycling achievements.
The 1957 Isle of Man Tourist Trophy was the Golden Jubilee event and the second race in the 1957 Motorcycle World Championships.
Tarquinio Provini was an Italian professional Grand Prix motorcycle road racer. He was a two-time world champion in road racing. Provini was also a four-time Isle of Man TT winner and won 13 Italian national championships.
Cecil Charles Sandford was a British professional Grand Prix motorcycle road racer. He competed in the FIM motorcycle Grand Prix world championships from 1950 to 1957. Sandford was a two-time FIM road racing world champion and a two-time winner at the Isle of Man TT.
Fabrizio Lai is a Grand Prix motorcycle road racer from Italy. He currently competes in the CIV Superbike Championship, aboard a MV Agusta F4.
The MV Agusta 500cc road racers were motorcycles that the manufacturer MV Agusta built and which were used to compete in 500cc Grand Prix motorcycle racing series between 1950 and 1976. 18 500cc world championship titles were achieved with these machines ridden by John Surtees, Gary Hocking, Mike Hailwood, Giacomo Agostini and Phil Read between 1958 and 1974.
The MV Agusta 350 cc racers were motorcycles produced by MV Agusta between 1954 and 1976 and raced in the 350 cc motorcycle GP championships. 10 world titles were achieved by riders John Surtees, Gary Hocking and Giacomo Agostini on these machines.
The MV Agusta 350 6 cilindri was a prototype racing motorcycle built by the Varese company MV Agusta in 1957, for the 350 cc class of the FIM Motorcycle World Championship. The project was resurrected in 1968. Neither version was ever used in a race. The only surviving model is now in the MV Agusta factory museum.
The MV Agusta 250 Monocilindrica Bialbero was a 250 cc factory racer manufactured by the Italian brand MV Agusta from 1956 to 1959. With this machine 15 GPs, 2 Driver Championships and 2 manufacturers World Championships were won.
The MV Agusta 250 Bicilindrica was a 250 cc factory racing motorcycle manufactured by the Italian brand MV Agusta from 1957 to 1961. With this machine 11 GPs, 2 Driver Championships and 2 manufacturers World Championships were won.
The MV Agusta 203 Bialbero and MV Agusta 220 Bialbero were Italian factory racing motorcycles made by MV Agusta to compete in the 1955 250 cc World Motorcycle Racing Championship. The machine won three GPs and with it MV Agusta won that year's 250 cc Constructors Championship.
Arturo Magni was an Italian engineer racing team manager and entrepreneur.
Piero Remor was an Italian engineer and motorcycle constructor, best known for his work for the Gilera and MV Agusta brands.
