Suzuki 250 GP Racers

Suzuki 250 RV 63 1962

The RV 61 was a fairly simple engineered motorcycle. It was an air - cooled single cylinder with a rotary inlet, which delivered 28 hp at 9,000 rpm.
1962: Suzuki RV 62

At the end of 1961 Suzuki helped East German driver Ernst Degner flee to the West with his family. In addition to a good driver, he was also technician and right-hand engineer Walter Kaaden , who had developed the two-stroke engine at MZ and refined the expansion outlet technology . That technique took Degner along to Suzuki, and in the winter of 1961-1962 he went to work with the Japanese technicians to make the Suzuki's faster.

The RV 62 also benefited from the developments, and probably already delivered approximately 42 hp. The top speed was about 210 km / h, while the RV 61 was only 190 km / h, but this task was probably estimated to be much higher than the actual top speed. The engine was now "square". Bore and stroke were both 54 mm. The engine had the same problems that followed the 125 cc Suzuki RT 61 : the big-end bearers went a lot. As a result, the RV 62 never became a success. Only points scored were scored once: Frank Perris became 5th in the TT of Assen and ended as 20th in the 250cc world championship.
1963: Suzuki RV 63

In 1963, Suzuki was almost out of season at the international 250cc races. While it went well in the 50 and 125cc class ( Hugh Anderson picked both world titles), it was only in the GP of Japan to start with a brand new 250cc machine, which was actually built from two RT 63 two-cylinder. The bore / impact ratio was therefore identical and this RV 63 delivered 50 hp. Water cooling had to be applied, but it still worked according to the thermosifon principle . The mixing lubrication Suzuki used to date was replaced by lubrication with an oil pump. The setting of the carburettors caused major problems and the frame was struggling to process the high capacity. In addition, the wheelbase was quite long because the cylinders stood apart.

Specs

Suzuki RV62 1962
Engine type: Air-cooled 247.34 cc twin cylinder rotary valve 2-stroke. 15 ps/ 10.000 rpm.
Bore x stroke: 54.0 x 54.0 mm
Carburetor type: M29
Compression ratio: 9:1
Top speed: 210 kph
Clutch type: Dry multiple plates
Transmission: 6 gears
Tyres: 2.75-18 / 3.00-18
Brake type (front): 2 drums, 1 cam
Brake type (rear): 1 drum, 1 cam

250 RZ 64 & RZ 65 1964

The Suzuki company built and tuned extremely competitive vehicles in the 50-cc. and 125-cc. classes. Then it tried to achieve comparable results with a larger-displacement—250-cc. —engine, because that class had become extremely important from the commercial point of view during the early 1960s.

The Suzuki 250 made its racing debut at the 1963 Japanese Grand Prix trials. Its engine, consisting of a pair of two-cylinder 125s that had been put together with a water-cooling system, was a technical novelty for racers. The cylinders of the RZ 63 (the 250) were arranged in a square. There were two separate counterrotating drive shafts held together by the gearing of the primary transmission. Although this arrangement was fairly complex, it reduced the front section. At the same time it required a fairly long, and therefore less manageable, chassis.

The Suzuki 250 RZ 63 was entered in the 1964 and 1965 world championships. Its best performance was third place at the 1965 Tourist Trophy, which was too little for a motorcycle that, at the time of its debut, boasted the highest power that had yet been achieved by a 250-cc. engine.

Motorcycle: Suzuki 250 RZ 63 Manufacturer: Suzuki Motor Co. Ltd.,
Hamamatsu Type: Racing Year: 1964
Engine: Suzuki four-cylinder, arranged in a square, with distribution through four rotating disks. Displacement 247.4 cc. (43 mm. x 42.6 mm.)
Cooling: Water
Transmission: Six-speed block
Power: 55 h.p. at 12,500 r.p.m.
Maximum speed: Over 140 m.p.h.
Chassis: Double cradle, continuous, tubular. Front and rear, telescopic suspension
Brakes: Front, central drum, four shoes; rear, central drum