Years raced: 1958

This engine is a development of the 500 4 cylinder engine
with the objective of increased power output. It takes part,
after several tests, in the World Championship round at
Monza in 1958 (J. Hartle). The improved acceleration did
not however correspond to a increased power.

ENGINE: Technical Specification (1958)

Cylinders / Cycle: 6 / 4 stroke
Displacement: 499.2 cc
Bore x stroke: 48 x 46 mm x 6
Compression ratio: 10.8:1
Power / rpm: 70 HP / 15000
Torque / rpm: NA
Cooling: air
Distribution: double overhead cam - 12 valve
Carburettor: 6 - 26 mm carburetors
Ignition: magneto
Lubrication: wet sump
Starting: pushstart
Primary drive: gear
Clutch: wet multiple plate clutch
Gearbox: 6 speeds
Final drive: chain


Frame: double cradle tubular steel
Front suspension: telescopic hydraulic fork
Rear suspension: swingarm with hydraulic shocks
Front brake: double 250mm drum brake
Rear brake: 220 mm drum brake
Front tire: 3.00x18”
Rear tire: 3.50x18”
Wheels: spokes
Tank: 22 litres
Length: 1950 mm
Width: 530 mm
Wheelbase: 1310 mm
Weight: 145 Kg

Performance: Speed: ? kph