Gilera 633721, Workshop Manual

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Engine
ENGINE
Specification Desc./Quantity
Engine Single-cylinder, four-stroke
Bore 92 mm
Stroke 69 mm
Cubic capacity 460 cm³
Compression ratio 10.5: 1
Timing system Single overhead camshaft with integrated tone wheel, control
from flywheel side chain, 4 valves and automatic start-up valve
lifting device.
Valve clearance: intake 0.15 mm (when cold)
Valve clearance: discharge 0.15 mm (when cold)
Valve clearance adjustment By threaded adjuster on the rockers
Engine idle speed 1500 ± 50 rpm
Air filter sponge, impregnated with mixture (50% petrol and 50% oil)
CO % value (measured at the intake manifold) 1 - 1.5%
Starting system Electric starter system with freewheel.
Lubrication By trochoidal pump (inside the crankcase), pressure adjust-
ment by-pass and oil filter.
Lubrication pressure 4 bar
Minimum allowed (at 100° C) 0.8 bar
Fuel supply Electronic injection system with electric fuel pump, Ø 38 mm
throttle body and single injector.
Max. power (shaft) 29 kW (39 CV) at 7250 rpm
Max. torque (shaft) 40 N·m (4 kgm) at 5500 rpm
Cooling system Fluid circulation through a motor-driven pump, 3-way thermo-
stat and electric fan.
Transmission
TRANSMISSIONS
Specification Desc./Quantity
Transmission With automatic expandable pulley variator with torque server,
V belt, automatic clutch, gear reduction unit and transmission
housing with forced air circulation cooling.
Capacities
CAPACITY
Specification Desc./Quantity
Engine oil (empty) 1.7 lt.
Engine oil (at oil and filter change) 1.5 lt.
Fuel tank (including reserve approx. 2 litres) approx. 14.5 litres
Rear hub approx. 250 cc.
Cooling system approx. 1.8 litres
Front fork approx. 242 ± 3 cc (in each fork leg)
Electrical system
ELECTRICAL SYSTEM
Specification Desc./Quantity
Electronic ignition inductive, high efficiency integrated with the injection system,
with variable timing and separate HV coil.
Spark plug NGK CR7EKB
Spark plug CHAMPION RG6YC
Nexus 500 euro 3
Characteristics
CHAR - 9