Year of presentation : 1977
Years of manufacture : 1978-1983
Engine : 4-stroke, parallel twin inclined 10°, air-cooled - bore x stroke 2 x (78 x 52) mm - total displacement 496.7 cc - compression ratio 9.6:1 - desmodromic distribution by overhead camshaft and chain with two valves inclined at 60° - wet sump with pump - 2 Dell'Orto PHF 30 BD carburettors with diaphragm injection pump - multi-disc clutch in oil bath with steel and phenolic resin discs - 5-speed gearbox - primary transmission by gears - secondary transmission by chain.
Chassis : tubular steel frame - Telesco hydraulic front fork - swingarm rear fork with 2 Telesco Hydrobag gas shock absorbers - Brembo dual disc hydraulic front brake Ø 260 mm - Brembo single disc hydraulic rear brake Ø 260 mm - light alloy wheels - 3.25 x 18" front tyre - 3.50 x 18" rear tyre
Electrical installation: Yuasa 12V-18Ah battery. - Motoplat PT. 586.1 150W alternator generator. - Motoplat 12V electronic regulator. - 12V 60/55W halogen headlight and 12V 3W front position light. - 12V 21/5W rear light. - 12V 21W indicators. - Motoplat electric starter motor.
Dimensions: wheelbase 1410 mm - dry weight 178 kg - fuel tank 14 litres.
Performance : 47 hp at 8500 rpm - maximum speed 160 km/h in normal position - fuel consumption 5 litres/100 km.
Colour scheme: Metallic orange paint for the tank and side covers. Chrome for the mudguards and black for the headlight, frame, swingarm, and chain guard. In the second version, the main colour was grey with orange and black plastic trim in the form of wide pinstriping. It had a seat that attached to a small tail section, and the Motoplat ignition was electronic.
Note: To address the lubrication problems that plagued the Twin, the Desmo included an oil cooler that provided the engine with a flow of fresh oil. Desmodromic valve actuation was also adopted to resolve issues with the valve springs, tappets, and timing chain: spring bounce, loss of tension in the timing chain causing rattling, etc.
Source: perso.wanadoo.es (archive)
