Suzuki Boulevard M50 User Manual

ENGINE 3-41
PISTON
PISTON DIAMETER
Using a micrometer, measure the piston outside diameter at the
place shown in Fig. If the measurement is less than the limit,
replace the piston.
 Piston diameter
Service Limit: 82.880 mm (3.2630 in)
 09900-20204: Micrometer (75 – 100 mm)
PISTON-TO-CYLINDER CLEARANCE
As a result of the aforesaid measurement, if the piston to cylin-
der clearance exceeds the following limit, overhaul the cylinder
and use an oversize piston, or replace both cylinder and piston.
 Piston to cylinder clearance
Service Limit: 0.120 mm (0.0047 in)
Piston oversize: 0.5, 1.0 mm
PISTON RING TO GROOVE CLEARANCE
Using a thickness gauge, measure the side clearances of the
1st and 2nd rings. If any of the clearances exceeds the limit,
replace both piston and piston rings.
 Piston ring-groove clearance
Service Limit (1st) : 0.180 mm (0.007 in)
(2nd): 0.150 mm (0.006 in)
 Piston ring groove width
Standard (1st) : 1.01 – 1.03 mm (0.0398 – 0.0406 in)
(2nd): 1.21 – 1.23 mm (0.0476 – 0.0484 in)
(Oil) : 2.51 – 2.53 mm (0.0988 – 0.0996 in)
 Piston ring thickness
Standard (1st) : 0.970 – 0.990 mm (0.0382 – 0.0390 in)
(2nd): 1.170 – 1.190 mm (0.0461 – 0.0469 in)
 09900-20803: Thickness gauge
09900-20205: Micrometer (0 – 25 mm)
15 mm (0.6 in)
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)