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Specifications (500 cc 4-stroke, 4-valves H
2
0 en-
gine)
ENGINE
Type .................................... single-cylinder, 4-stroke
Bore................................................................ 92 mm
Stroke ............................................................. 69 mm
Displacement ............................................... 460 cm
3
Compression ratio ......................................... 10.5 : 1
Timing ............................ chain-operated overhead sin-
gle-shaft flywheel side, inte-
grated phonic wheel, 4-
valves and automatic start-
ing valve lifter
Valves play: intake ...................................... 0.20 mm
exhaust ................................... 0.20 mm
Valves play
adjustment................ threaded register on equalizers
Idle speed............................................. 1450±50 rpm
CO% value .................................................... 1±1.5%
Starting system ................................... electric starter
Lubrication...................... trochoid pump (inside the
crankcase), oil filter and pres-
sure adjustment by-pass
Lubrication pressure.......................................... 4 bar
Minimum allowed pressure (at 100°C) ........... 0.8 bar
Fuel system .................... electronic injection with elec-
tric fuel pump, throttle body
Ø 38mm and single injector
Max power
(at crankshaft) .............. 29 kW (39 CV) bei 7250 rpm
Max torque
(at crankshaft) ............ 40 N·m (4 Kgm) bei 5500 rpm
General information and Maintenance
Cooling system ............... liquid, by means of motor-
ized pump, 3-way thermo-
stat and electric fan.
Transmission .................. automatic speed variator by
means of expanding pulleys,
V-belt, automatic clutch, re-
duction gear, and transmis-
sion compartment cooling by
air forced-circulation.
Ignition type .................... high efficiency inductive type
integrated with injection, vari-
able spark advance and
separated high voltage coil
Spark advance
(before T.D.C.) ............... variable controlled by injec-
tion power unit
Spark plug ...............................CHAMPION RG 6 YC
NGK CR7 EKB
Engine-wheel ratio ............................ short: 1/11.988
long: 1/ 4.86
Engine oil ....................... SAE 5W/40 exceeding API
SJ specifications
Quantity ........................................................... ~ 1.7 l
Hub oil ............................................... TUTELA ZC 90
Quantity ............................................................ 250cc
Cooling system capacity ................................. ~ 1.8 l
0.15mm
0.15mm
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