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1.6
Analysis of exhaust muffler of 4-stroke engine
The exhaust muffler of 4-stroke engine emits blue and
white thick smoke.
Yes
The oil in crankcase is too much.The redundant oil
should be discharged and let the oil level not exceed
the upper mark.
Check whether valve and
valve pipe are worn.
Yes
Readjust it.
[1]Check whether the elasticity of cluth spring is well-
proportioned.
[2]Check whether drive or driven hub tooth of clutch is worn
to sawtooth.
[3]Check whether friction steel pieces of clutch are distorted.
[4]Check whether the components of operation system of
clutch are worn.
Check whether the oil level of crank-
case exceeds the upper mark.
Start engine.When it runs with high speed,remove oil
ruler and check whether the oil adding hole emits smoke.
No
Check whether the match clear-
ance of valve and valve pipe is
too big.
Yes
Oil seal of valve is
damaged.
1.7
Analysis of gearshift
Gearshift of derailleur
is difficult.
Start engine and check whether the idle speed of engine
is too fast.
Check whether cluth disengages
uncompletely.
Yes
No
[1]Check whether cylinder,piston
and piston ring are worn.
[2]Check whether piston ring has
poor elasticity or is dead.
[3]Check whether the opening of
No
piston ring has 120°to another
opening.
No
Check whether operation of gearshift
is harmonious.
Improve operation
method.
No
Check whether the gearshift axle is
distorted or whether gearshift arm
is distorted or worn.
No
[1]Check whether camshaft of gearshift or
cam trough inside is worn or damaged.
[2]Check whether the fork is worn.
[3]Check whether the fork is distorted.
[4]Check whether the fork axle is distorted
or worn.
Yes
Yes
Replace it.
61
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