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1. S omething w rong w ith
the fuel system.
Normal c
ylinder
▲
compression.
▲Normal spark.
▲Fuel flows easily a nd
smoothly
T
R
O
U
B
L
E
1.Spark p
lug
is i
abnormal.
Normal c
ylinder
▲
compression.
▲Norma fuel supply
▲Normal high－Pressure
coil spark
1.No h igh－Pressure c oil
spark.
Normal c
ylinder
▲
compression
▲Normal fuel supply
▲Normal spark plug
1.
Poor cylinder compression
▲ Normal f uel supply
system
▲Normal ignition system
WARNING
When testing the spark , never hold the high－voltage wire of the spark plug with wet hand.
Make s ure there is n o spilled fuel outside t he e ngine a nd t hat the spark p lug isn't d ipped
with fuel.
To prevent fire , keep sparks far away from the spark plug mount hole.
Having fulfilled all the check items above , if the engine still fails to work , contact your dealer
for help.
Needle v alve i s closed i mproperly o r
start hole is clogged.
Floater is damaged or sticking. R
Fuel is filthy or deteriorated
There is water in fuel
Too much fuel in engine cylinder
Wrong fuel brand
C
A
U
n
Too much fuel carbon fouling and dirt
around electrodes
Electrodes
are
seriously or insulators damaged
Improper electrodes gap
High－pressure coil is damaged
Ignition coil damaged
Magneto loses magnetism
Piston ring is w orn or even over its
wear limit.
Piston ring is sticking
Piston ring is broken
Spark p lug is not i nstalled tighten o r
without a gasket
Air leakage between c ylinder block
and cylinder
Air leakage from valve
Dismantle
repair, clean blow to get through
epair floater
Replace
Replace
Drain e xtra f uel , dry up s park
plug electrodes.
Select p
corresponding with requirements
S
E
Clear away
burn
damaged
Replace spark plug
Adjust to proper value
Replace
Replace
Replace
Replace a set of piston rings
Clear up carbon fouling
Replace
Tighten with a gasket in
Check c ylinder gasket a nd t he
flatness o f the surface b y which
cylinder block contacting with
cylinder heat , tighten c ylinder
bolts in t he o rder t o stipulated
torque
Check v alve
tightness , repair if necessary
33
needle v alve a nd
roper
fuel b
rand
R
E
M
E
D
Y
clearance
and
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