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（1）Ignition Time Adjustment
If there is a wrong ignition advance angle，it will cause a series of problems,such as hard engine starting ,
power decrease,high fuel consumption,engine overheating,uncomplete fuel burning,exhaust value overrun,
short service lifetime and so on.Therefore,adjust ingiton advance angle firstly.
If ignition system cannot work well,check electrical ignition device,high voltage coil,ignition coil and
triggering loop of magneto and so on.
（2）Carburetor Adjustment
Carburetor adjustment is very important,which directly decides the performance of engine,so maintain
it as the following:
Before carburetor adjustment,make sure the operation temperature of engine is in order,open choke
valve,check whether the valve clearance and ignition timing are right,and ensure no leakage or block of
engine and carburetor. Carburetor adjustment includes idle adjustment and fluid level adjustment of float
chamber.The adjustment can make the operation of engine idle stabler and avoid poor or rich oil in
carburetor.
（3）Clutch Adjustment
Clutch is used to transfer power,so it plays an important role in transmission system.Adjust the free stroke
of clutch operation grip within 10mm and 20mm.For some motorcycles,there is a need to adjust adjust-
ing bolts of disengagement parts.
Table 2-1
Free stroke of front brake lever
Free stroke of rear brake pedal
Free stroke of throttle control grip
Depth of flower pattern on tire surface
Stroke of front shock absorber
Free length of front shock absorber spring
Stroke of rear shock absorber
Free length of rear shock absorber spring
Wheel hub runout
Axle runout
8
Section 3 Adjusting Data of Maintenance
operation/ brake/ shock absorber/wheel
items
a x i a l
r a d i a l
f r o n t
r e a r
Standard Value (mm)
10～20
20～30
2～6
4. 0
130
425
45
235
limit Value (mm)
20～30
30～40
10～12
2.0
0.8
0.8
0.8
0.8
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