WFM M06 (prototype)
The recently established WFM factory (Warszawska Fabrica Motocyklowa) presented in 1952 a prototype of a completely new motorcycle with a cylinder capacity of 125cc. This machine, designated the M06, had a completely different single closed frame and a new S02 engine. The electrical system included a battery and an electromagnetic sound signal. A novelty was the suspension of the rear wheel on a trailing arm, cooperating with spring elements with hydraulic damping. The front telescopic fork also uses hydraulic damping. The performance of the brakes was improved by introducing a system of two concurrent shoes (Duplex) in both wheels of the motorcycle. Thus, the prototype of the M06 was a modern machine, but unfortunately it did not see mass production.
Engine - Type S02, with spark ignition. Other data as SHL M04, with the following changes: Compression ratio 7.5. The engine is lubricated with a mixture of fuel and oil in the ratio of 25 : l. Power supply: Jikov 16 type horizontal carburettor with a throat diameter of 16 mm. Air filter with metal mesh and start-up cover.
Electrical system - Rated voltage 6 V. Spark ignition. Alternating current magneto generator, mounted on the crankshaft journal. Selenium rectifier. 6 V lead battery, 7 Ah capacity. Headlight with an optical system diameter of 130 mm, with high beam, symmetrical dipped beam and position light. Disc sound signal, attached to the front beam of the frame.
Drive system - Friction clutch, wet, multi-plate, mounted on the main shaft of the gearbox. Friction discs with cork inserts. Transmission of engine drive to the clutch with a single-row 3/8" X 7.5 mm chain. Gear box with three speeds. Gears constantly meshed. Gear shifting with foot lever located on the left side. Drive output to the rear wheel on the right side of the vehicle. Transmission to the rear wheel with a single-row 1/2" X 7.75 mm chain.
Carrying system - Closed frame, single, welded. Two ball bearings embedded in the head tube. Front wheel suspension on telescopic fork, with oil damping. Front wheel travel 125 mm. Rear wheel suspension on trailing arm, with two spring elements, with coil springs and telescopic shock absorbers. Rear wheel travel 80mm. Spoked road wheels. Thru-wheel axles. Tube tyres, 3.00-19".
Brakes and Steering - Duplex brakes, mechanically actuated independently. Pressed steel brake drums, 125 mm diameter. Tubular steel handlebars, clamped to the fork shelf. Clutch levers and hand brake pressed from sheet steel.
Body - Deep pressed steel mudguards. The front mudguard is attached to the movable part of the fork. Fuel tank welded from sheet steel stampings.
The riders's saddle with a rubber covering, suspended on a central spring. Adjustable riders's footrests with rubber pads. Central stand, welded from pressed sheet metal. Incomplete cover of the drive chain (from above). Lower exhaust system with removable muffler, mounted on the right side of the motorcycle.
Dimensions - Wheelbase approx. 1300mm. Total length approx. 2000 mm, width approx. 700 mm.
Weights - Motorcycle approx. 95 kg. Permissible load 130 kg.
Capacity - Fuel tank 13 litre. Gear box 0.5 litre.
Operating data - Top speed 70 km/h. Fuel consumption approx. 3 litre /100 km. Air pressure in the tyres of the front wheel 0.06 MPa (0.6 kG/cm2), rear wheel 0.10 MPa (1.0 kG/cm2).
The first machine, named the WFM, was a 125cc class motorcycle, marked with the M06 symbol. It was a modern design, which was a development of the previously produced M04 and M05 motorcycles.
The production of this motorcycle began in 1954 by the Warsaw Motorcycle Factory. Soon, WFM motorcycles were the most popular vehicles in our country. On March 26, 1958, the WFM crew made the motorcycle with the number 100,000. In addition to the quantitative development of the production of the M06 motorcycle, its design was also developed to improve performance and increase durability. The most important changes introduced to production include: the use of a new 28 W generator in 1957, the introduction of a battery, a selenium rectifier, electromagnetic signal and speedometer with odometer. A year later, a new carburetor with a throat diameter of 20 mm was used, an air filter was built between the tool boxes, the saddle was raised and the mounting of the trunk on the fuel tank was improved. WFM M06 motorcycles. they were produced until 1965.
Engine - Type SOI, spark ignition. Data as for the SHL M05, with the following change: power supply: horizontal carburetor, type G16, throat diameter 16 mm, fixed directly to the cylinder.
Electrical installation - Data as for the SHL M05 motorcycle.
Drive system - Friction, wet, three-disc clutch, mounted on the main shaft of the gearbox. Friction discs with cork inserts. Six helical compression springs. Worm type switching mechanism. Power transmission from the engine to the clutch with a 3/8" X 7.5 mm single row chain. Number of links 44. Gear ratio 2.31 (30/13). Gearbox with three ratios. Constantly meshing gears. Ratios in individual gears: Ib -3.16, IIb-1.49, IIIb-1.00 Gear change with a foot lever on the left side Drive output to the rear wheel on the right side of the vehicle Transmission to the rear wheel with a single-row 1/2 roller chain "x7.75mm. Number of links 118. Gear ratio 3.42 (41/12). Chain tension adjustment with two-way tensioners located on the rocker arms.
Chassis - Closed, double frame, welded from steel U-sections. Two ball bearings in the head tube. Front wheel suspension on telescopic fork, no oil damping. Double coil springs with progressive action. Fork shelves made of pressed pressed metal. Fork legs rolled from sheet steel. Rubber covers in the lower part of the fork. Front wheel travel 140 mm. Rear wheel suspension on trailing arm, with two spring elements with coil springs and telescopic shock absorbers. Rear wishbone made of steel tubes, with a rectangular cross-section. Rear wheel travel 80 mm. Spoked road wheels, 36 spokes. Rims made of steel, dimensions 1.7X19". Tube tyres, dimensions 3.00-19".
Braking and Steering - Mechanically actuated, independent, drum brakes. Brake drums made of pressed pressed metal. Internal diameter of brake drums 125 mm. The width of the friction linings is 20 mm. Front brake (handbrake) controlled by Bowden cable. The rear foot brake, controlled by a rigid linkage, with smooth regulation, is placed on the right side of the motorcycle. Handlebar made of steel tube, fixed with two clamps to the top shelf of the fork. Clutch and handbrake levers pressed from sheet steel. Winding type "gas" twist handle. Speedometer drive from the rear wheel with a flexible shaft.
Bodywork - Data as for the SHL M05 motorcycle, with the following changes: Two-seater bench seat, micro-rubber, covered with winiderm. Frame carrier (pressed from sheet metal), mounted on the fuel tank. Passenger footrests foldable, without rubber pads. Riders's footrests with rubber pads.
Dimensions - Wheelbase 1300 mm. Length 2020 mm, width 670 mm, height 980 mm. Seat height 750 mm. Ground clearance 160 mm.
Weights - Motorcycle 88 kg. Permissible load 160 kg. Permissible total weight 250 kg.
Capacity - Fuel tank 12.5 litre (including 2 litre reserves). Gear box 0.5 litre.
Operating data - Top speed 70 km/h. Fuel consumption 3.0 liters 3/100 km. Minimum turning circle 3.2 m. Tyre pressure: front 0.10 MPa (1.0 kg/cm2), rear 0.15 MPa (1.5 kG/cm2).
The WFM company also built the OSA Scooter
Source: Polish History Archive