Suzuki drz 400 2002 Service Manual

5-2 COOLING SYSTEM
COOLING SYSTEM
DESCRIPTION
The engine is cooled by the forced circulation of engine coolant, using a high-capacity, centrifugal water
pump, through water jackets formed
in the cylinder and cylinder head, and through the radiator. The tube-
and-fin type radiator is made of aluminum, which is characterized by lightness in weight and good heat
dissipation.
A
wax-pellet type thermostat is used to regulate the flow of engine coolant through the radiator. As the
coolant temperature rises to about
75 °C (16]oF) the thermostat valve unseats and a normal coolant flow is
established. At about 90°C (194° F) the thermostat becomes completely open and, as a result, heat is re-
leased to the atmosphere through the radiator core.
Referring
to the following illustration, the thermostat is in the closed condition, so that engi ne coolant re c ir-
culates through the route comprising the water pump, engine, by-pass hole of the thermostat and radiator in
the regu lated condition.
CD Impeller
® Radi ato r cap
@ RighI radiator
C!) L eft radiator
® Th e rm os tat
4
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Suzuki drz 400 2002 Specifications

General

Displacement	398 cc
Bore x Stroke	90.0 mm x 62.6 mm
Compression Ratio	11.3:1
Cooling System	Liquid-cooled
Fuel System	Mikuni BSR36 carburetor
Starter	Electric
Transmission	5-speed constant mesh
Final Drive	Chain
Front Suspension	Telescopic, coil spring, oil damped
Rear Suspension	Link type, coil spring, oil damped
Front Tire	80/100-21
Seat Height	935 mm (36.8 in)
Ground Clearance	300 mm (11.8 in)
Wheelbase	1, 485 mm (58.5 in)
Dry Weight	119 kg (262 lbs)
Engine Type	4-stroke, single cylinder, DOHC
Ignition	CDI
Front Brakes	Disc
Rear Brakes	Disc
Rear Tire	120/90-18
Fuel Capacity	10.0 L (2.6 US gal)