Page 48 of 74

PERIODIC MAINTENANCE AND ADJUSTMENT
7-9
7
EAU41711
Middle and final gear cases The middle and final gear cases must
be checked for grease leakage before
each ride. If any leakage is found, have
a Yamaha dealer check and repair the
motorcycle. In addition, have a
Yamaha dealer check and lubricate the
middle and final gears at the intervals
specified in the periodic maintenance
and lubrication chart.
EAU40903
Cleaning the air filter element The air filter element should be cleaned
at the intervals specified in the periodic
maintenance and lubrication chart.
Clean or, if necessary, replace the air
filter element more frequently if you are
riding in unusually wet or dusty areas.
1. Remove the seat. (See page 4-7.)
2. Remove the air filter case cover by
removing the screw.
3. Pull the sponge material out, clean
it with solvent, and then squeeze
the remaining solvent out.4. Apply oil of the recommended type
to the entire surface of the sponge
material, and then squeeze the ex-
cess oil out.
TIPThe sponge material should be wet but
not dripping.
1. Air filter case cover
2. Screw
2 1
1. Sponge material
1
U5PG8AE0.book Page 9 Thursday, April 8, 2010 8:37 AM
Page 68 of 74

SPECIFICATIONS
9-1
9
Dimensions:Overall length:
1245 mm (49.0 in)
Overall width:
575 mm (22.6 in)
Overall height:
715 mm (28.1 in)
Seat height:
485 mm (19.1 in)
Wheelbase:
855 mm (33.7 in)
Ground clearance:
105 mm (4.13 in)
Minimum turning radius:
1300 mm (51.2 in)Weight:With oil and fuel:
39 kg (86 lb)Noise and vibration level:Noise level (77/311/EEC):
PW50 75.1 dB(A)@2750 r/min
Vibration on seat (EN1032, ISO5008):
PW50 Will not exceed 0.5 m/s²
Vibration on handlebar (EN1032, ISO5008):
PW50 Will not exceed 2.5 m/s²Engine:Engine type:
Air cooled 2-stroke
Cylinder arrangement:
Forward-inclined single cylinder
Displacement:
49 cm³
Bore × stroke:
40.0 × 39.2 mm (1.57 × 1.54 in)Compression ratio:
6.00 :1
Starting system:
Kickstarter
Lubrication system:
Separate lubrication (Yamaha autolube)
Engine oil:Type:
YAMALUBE 2S or 2-stroke engine oil
(JASO FC grade) or (ISO EG-C or EG-D
grade)
Engine oil quantity:
Quantity:
0.30 L (0.32 US qt, 0.26 Imp.qt)Transmission oil:Type:
YAMALUBE 4 (10W-40) or SAE 10W-40
Oil change quantity:
0.30 L (0.32 US qt, 0.26 Imp.qt)Air filter:Air filter element:
Wet elementFuel:Recommended fuel:
PW50 Regular unleaded gasoline only
PW50A1 Regular unleaded gasoline only
(CAN)
PW50A1 Unleaded gasoline only
(AUS)(NZL)
Fuel tank capacity:
2.0 L (0.53 US gal, 0.44 Imp.gal)Carburetor:Type × quantity:
VM12SC x 1
Spark plug(s):Manufacturer/model:
NGK/BPR4HS
Spark plug gap:
0.6–0.7 mm (0.024–0.028 in)Clutch:Clutch type:
Wet, centrifugal automaticTransmission:Primary reduction system:
Spur gear
Primary reduction ratio:
63/33 (1.909)
Secondary reduction system:
Shaft drive
Secondary reduction ratio:
19/15 × 54/11 (6.218)Chassis:Frame type:
Steel tube backbone
Caster angle:
25.50 °
Trail:
50.0 mm (1.97 in)Front tire:Type:
With tube
Size:
2.50-10 4PR
Manufacturer/model:
BRIDGESTONE/KNOBBY
Manufacturer/model:
IRC/KNOBBY
U5PG8AE0.book Page 1 Thursday, April 8, 2010 8:37 AM
Page 69 of 74
SPECIFICATIONS
9-2
9
Rear tire:Type:
With tube
Size:
2.50-10 4PR
Manufacturer/model:
BRIDGESTONE/KNOBBY
Manufacturer/model:
IRC/KNOBBYLoading:Maximum rider weight:
25.0 kg (55 lb)Tire air pressure (measured on cold
tires):
Front:
100 kPa (1.00 kgf/cm², 15 psi)
Rear:
100 kPa (1.00 kgf/cm², 15 psi)
Front wheel:Wheel type:
Panel wheel
Rim size:
10x1.50Rear wheel:Wheel type:
Panel wheel
Rim size:
10x1.50Front brake:Type:
Drum brake
Operation:
Right hand operation
Rear brake:Type:
Drum brake
Operation:
Left hand operationFront suspension:Type:
Telescopic fork
Spring/shock absorber type:
Coil spring/oil damper
Wheel travel:
60.0 mm (2.36 in)Rear suspension:Type:
Unit swing
Spring/shock absorber type:
Coil spring/oil damper
Wheel travel:
50.0 mm (1.97 in)Electrical system:Ignition system:
CDI
U5PG8AE0.book Page 2 Thursday, April 8, 2010 8:37 AM