Suzuki Boulevard M50 User Manual

3-42 ENGINE
PISTON RING FREE END GAP AND END GAP
Before installing piston rings, measure the free end gap of each
ring using vernier calipers. Next, fit the ring in the cylinder, and
measure each ring end gap using a thickness gauge.
If any ring has an excess end gap, replace the ring.
 Piston ring free end gap
Service Limit (1st) : 7.7 mm (0.30 in)
(2nd): 9.4 mm (0.37 in)
 Piston ring end gap
Service Limit (1st) : 0.70 mm (0.028 in)
(2nd): 0.70 mm (0.028 in)
 09900-20102: Vernier calipers
09900-20803: Thickness gauge
Oversize piston ring
The following two types of oversize piston rings are used. They
bear the following identification numbers.
Oversize oil ring
The following two types of oversize oil rings are available as
optional parts. They bear the following identification marks.
Oversize side rail
Just measure outside diameter to identify the side rail as there is
no mark or numbers on it.
SIZE 1st 2nd
0.5 mm O.S. 50 50
1.0 mm O.S. 100 100
SIZE COLOR
STD NIL
0.5 mm O.S. Painted Red
1.0 mm O.S. Painted Yellow
0.5 mm O.S.
1.0 mm O.S.
Paint
Oil ring spacer
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)