Suzuki Boulevard M50 User Manual

ENGINE 3-27
ENGINE COMPONENTS INSPECTION
AND SERVICING
CYLINDER HEAD COVER
DISASSEMBLY

• Loosen the rocker arm shafts and pull out the rocker arm
shafts.
CYLINDER HEAD COVER DISTORTION
After removing sealant from the fitting surface of the cylinder
head cover, place the cylinder head cover on a surface plate
and check for distortion with a thickness gauge.
 Cylinder head cover distortion
Service Limit: 0.05 mm (0.002 in)
 09900-20803: Thickness gauge
If the distortion exceeds the limit, replace the cylinder head
cover.
ROCKER ARM SHAFT O.D.
Measure diameter of rocker arm shaft.
 Rocker arm shaft O.D. (IN. & EX.)
Standard: 11.977 – 11.995 mm (0.4715 – 0.4722 in)
 09900-20205: Micrometer (0 – 25 mm)
ROCKER ARM I.D.
When checking the valve rocker arm, the inside diameter of the
valve rocker arm and wear of the camshaft contacting surface
should be checked.
 Rocker arm I.D.
Standard: 12.000 – 12.018 mm (0.4724 – 0.4731 in)
 09900-20605: Dial calipers
Be sure to identify each removed part as to its loca-
tion, and lay the parts out in groups designated as
“No. 1 cylinder”, “No. 2 cylinder”, “Exhaust”, “Intake”,
so that each will be restored to the original location
during assembly.
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)