Service manual

SETTING
7-9
EC71J010
Plug chop
When checking the discoloration of the spark
plug and piston head, move the main switch to
“OFF” while running along a straight lane at
full throttle, disengage the clutch at the same
time and stop the engine. Then let your
machine go back to the pit by inertia. This is
called a “plug chop”.
CC
CAUTION:
• When you do a “plug chop”, pay attention
to your surrounding environment to avoid
interference with other riders.
• Do not shift down while riding your
machine by inertia (as it may cause a
seizure of the clutch push rod and ball).
EC71K010
Setting of cylinder gasket
The use of the supplied gaskets of different
thicknesses makes it possible to change the
combustion chamber volume.
Not much torque is felt with slow engine accel-
eration ≥ Reduce the combustion chamber
volume.
Torque is felt with no higher revolutions ≥
Expand the combustion chamber volume.
Thickness
Actual combustion
Type
chamber volume
0.6 mm Approx. 9.66 cm
3
STD
(0.024 in) (0.340 lmp oz, 0.327 US oz)
0.5 mm Approx. 9.43 cm
3
(0.020 in) (0.332 lmp oz, 0.319 US oz)
0.38 mm Approx. 9.20 cm
3
(0.015 in) (0.324 lmp oz, 0.311 US oz) Supplying
0.3 mm Approx. 8.98 cm
3
parts
(0.012 in) (0.316 lmp oz, 0.304 US oz)
0.2 mm Approx. 8.75 cm
3
(0.008 in) (0.308 lmp oz, 0.296 US oz)
TUN