Derived from the “Checca 83” , the 99 used the 5,5 HP single-cilinder engine that had been improved to give the bike a better smoothness on mixed tracks. The frame continued the design used on the 83; a tunular front end and pressed-steel rear portion. The engine was nestled in an open duplex cradle, and the engine case acted as a structural member. Besides the change in the 99 Checca from the 83 was the paint finish. Total build was 1,977 units and production ended in 1969. In 1962, a 124cc version was released with the engine developing 6,5 HP.
Engine: Technical Specification (1961)
Cylinders / Cycle: single / 4-stroke
Displacement: 98,9 cc
Bore x stroke: 50,7 x 49 mm
Compression ratio: 7,5:1
Power / rpm: 5,25 HP / 6,000
Torque / rpm: NA
Cooling: air
Distribution: pushrod
Carburettor: 16 mm carburettor
Lubrication: wet sump
Starting: kickstart
Primary drive: gear
Clutch: wet multiple plate clutch
Gearbox: 4 speeds
Final drive: chain
Chassis:
Frame: double cradle tubular and pressed steel frame
Front suspension: telescopic hydraulic fork
Rear suspension: swingarm with hydraulic shocks
Front brake: 123,5 mm drum
Rear brake: 118 mm drum
Front tire: 2.50 x17”
Rear tire: 2.50 x17”
Wheels: spokes
Tank: 14 litres
Length: 1870 mm
Width: 620 mm
Wheelbase: 1230 mm
Weight: 90 Kg
Performance: 80 kph