Periodic maintenance an d a djustment
7-21
7
EAU22762
Drive chain slack
The drive chain slack should be
checked before each ride and adjusted
if necessary.
EAU74251To check the d rive chain slack
1. Place the motorcycle on the side- stand.
TIP
When checking and adjusting the drive
chain slack, there should be no weight
on the motorcycle.
2. Shift the transmission into theneutral position.
3. Measure the drive chain slack as shown.
4. If the drive chain slack is incorrect, adjust it as follows. NOTICE: Im-
proper drive chain slack will
overloa d the en gine as well as
other vital parts of the motorcy-
cle an d can lead to chain slip-
pa ge or b reakag e. To prevent
this from occurrin g, keep the
d rive chain slack within the
specified limits.
[ECA10572] EAU40116
To a
djust the drive chain slack
Consult a Yamaha dealer before ad-
justing the drive chain slack. 1. Loosen the brake pedal free play adjusting nut, axle nut, and lock-
nut at each end of the swingarm.
2. To tighten the drive chain, turn the drive chain slack adjusting nut at
each end of the swingarm in direc-
tion (a). To loosen the drive chain,
turn the adjusting nut at each end
of the swingarm in direction (b),
and then push the rear wheel for-
ward.
1. Drive chain slack
Drive chain slack:40.0–56.0 mm (1.57–2.20 in)
1
1. Brake pedal free play adjusting nut
2. Locknut
3. Drive chain slack adjusting nut
1. Axle nut
2. Locknut
3. Drive chain slack adjusting nut
32
1
UBMA80E0.book Page 21 Wednesday, October 20, 2021 8:57 AM
Specifications
9-2
9
Spark plug(s):
Manufacturer/model:
NGK/CR6HSA
Spark plug gap:
0.6–0.7 mm (0.024–0.028 in)
Clutch:
Clutch type:Wet, centrifugal, shoe + multiple-disc
Drivetrain:
Primary reduction ratio:3.722 (67/18)
Final drive: Chain
Secondary reduction ratio:
2.500 (35/14)
Transmission type:
Constant mesh 4-speed
Gear ratio: 1st:
3.167 (38/12)
2nd: 1.941 (33/17)
3rd: 1.381 (29/21)
4th:
1.095 (23/21)
Chassis:
Frame type:Backbone
Caster angle:
26.0 °
Trail: 60 mm (2.4 in)
Front tire:
Type:
With tube
Size: 2.50-14 4PR
Manufacturer/model: CHENG SHIN/C-803
Speed rating:
120 km/h (75 mph)
Rear tire:
Type:With tube
Size:
3.00-12 4PR
Manufacturer/model: CHENG SHIN/C-803 Speed rating:
120 km/h (75 mph)
Tire air pressure (measure d on col d
tires):
Front:
100 kPa (1.00 kgf/cm², 15 psi)
Rear: 100 kPa (1.00 kgf/cm², 15 psi)
Front wheel:
Wheel type: Spoke wheel
Rim size: 14 x 1.40
Rear wheel:
Wheel type:
Spoke wheel
Rim size: 12 x 1.60
Front brake:
Type:
Mechanical leading trailing drum brake
Rear brake:
Type:
Mechanical leading trailing drum brake
Front suspension:
Type:Telescopic fork
Spring: Coil spring
Shock absorber:
Hydraulic damper
Wheel travel: 115 mm (4.5 in)
Rear suspension:
Type:
Swingarm
Spring: Coil spring
Shock absorber: Gas-hydraulic damper
Wheel travel:
110 mm (4.3 in)
Electrical system:
System voltage:12 V
Ignition system:
CDI
Charging system: AC magneto
UBMA80E0.book Page 2 Wednesday, October 20, 2021 8:57 AM
