Suzuki Boulevard M50 User Manual

FUEL SYSTEM AND THROTTLE BODY 6-21
STP SENSOR ADJUSTMENT
If the STP sensor adjustment is necessary, measure the sensor
out put voltage and adjust the STP sensor position as follows:
• Remove the air cleaner box. (6-13)
• Disconnect the STVA coupler. (6-13)
• Insert the needle pointed probes to the lead wire coupler.
• Turn the ignition switch ON.
• Close the secondary throttle valve by finger, and measure the
STP sensor out put voltage.
 STP sensor out put voltage
ST valve is fully closed: Approx. 0.5 V
(+ Y/W – - B/Br)
 09900-25008: Multi-circuit tester set
09900-25009: Needle pointed probe set
 Tester knob indication: Voltage ()
• If the STP sensor voltage is out of specification, loosen the
STP sensor mounting screw and adjust the STP sensor volt-
age to specification.
• Tighten the STP sensor mounting screw.
 09930-11950: Torx wrench
 STP sensor mounting screw:
3.5 N·m (0.35 kgf-m, 2.5 lb-ft)
FUEL INJECTOR REMOVAL
• Remove the fuel tank. (6-3)
• Remove the air intake pipe. (2-7)
• With battery negative cable disconnected, disconnect the
injector couplers.
• Remove the fuel delivery pipes. (6-15)
• Remove the fuel injectors #1 and #2. (6-15)
FUEL INJECTOR INSPECTION
Check fuel injector filter for evidence of dirt and contamination. If
present, clean and check for presence of dirt in the fuel lines and
fuel tank.
The fuel injector can be checked without removing it from the
throttle body.
Refer to page 5-66 for details.
V
B/BrB/Br
Y/W
Y/W
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)