Suzuki Boulevard M50 User Manual

7-10 COOLING AND LUBRICATION SYSTEM
ENGINE COOLANT TEMPERATURE SENSOR
REMOVAL
• Lift and support the fuel tank. (6-3)
• Remove the frame head covers. (3-3)
• Disconnect the engine coolant temperature sensor coupler
1.
• Keep the motorcycle upright.
• Place a rag under the sensor and remove the engine coolant
temperature sensor 2.
INSPECTION
• Check the engine coolant temperature sensor by testing it at
the bench as shown in the figure. Connect the temperature
sensor 1 to a circuit tester and place it in the oil contained in
a pan, which is placed on a stove.
• Heat the oil to raise its temperature slowly and read the col-
umn thermometer 2 and the ohmmeter.
• If the temperature sensor ohmic value does not change in the
proportion indicated, replace it with a new one.
 Temperature sensor specification
If the resistance is noted to show infinity or too much different
resistance value, replace the temperature sensor with a new
one.

Oil
Temperature Standard resistance
20 °C (68 °F) Approx. 2.45 kΩ
40 °C (104 °F) Approx. 1.148 kΩ
60 °C (140 °F) Approx. 0.587 kΩ
80 °C (176 °F) Approx. 0.322 kΩ
* Take special care when handling the temperature
sensor. It may cause damage if it gets a sharp impact.
* Do not contact the engine coolant temperature sen-
sor 1 and the column thermometer 2 with a pan.
SAMPLE

Suzuki Boulevard M50 Specifications

General

Compression Ratio	9.4:1
Fuel System	Fuel injection
Ignition	Electronic ignition (transistorized)
Transmission	5-speed constant mesh
Final Drive	Shaft drive
Front Suspension	Inverted telescopic, coil spring, oil damped
Front Tire	130/90-16M/C 67H, tubeless
Rear Tire	170/80-15M/C 77H, tubeless
Ground Clearance	140 mm (5.5 in)
Seat Height	700 mm (27.6 in)
Engine Type	4-stroke, liquid-cooled, V-twin
Bore x Stroke	83.0 mm x 74.4 mm
Rear Suspension	coil spring, oil damped
Front Brakes	Single hydraulic disc
Rear Brakes	Drum
Fuel Tank Capacity	15.5 L (4.1 US gal)
Wheelbase	1, 655 mm (65.2 in)