16 DR
®
VERTICAL SHAFT ENGINE
Chapter 7: Troubleshooting
Engine is difficult to start
Norma
l cylinder
compression
Somethin
g wrong with the fuel
system
Fuel supply is not
smoot
h or
no fuel
suppl
y
There is not enough fuel in fuel tank
and fuel cock is closed.
Fill fuel, open fuel cock.
Air vent in the fuel filler cap is clogged
Clean first and then dredge
Improper or clogged main Oil flow hole.
Readjust or clean, blow to get through.
Needle valve is not closed properly or
start hole is clogged.
Dismantle needle valve and re-pair, clean, blow to
get through.
Float is damaged or sticking.
Fuel is too filthy or deteriorated
Drain extra fuel, dry up Spark Plug electrodes.
Select proper fuel brand corresponding with the
requirements.
Norma
l fuel suppl
y system
Normal high
–
tension
line
Spark Plug
is in
bad conditions
Too much carbon deposit and dirt
around electrodes.
Electrodes are burn damaged seriously
or insulators damaged.
High-tensio
n line
no spar
k
High –tension line is damaged.
Ignition coil is damaged.
Wrong gap between ignition coil and
flywheel
Adjust gap between ignition and flywheel
Abnorma
l cylinder compressio
n
Norma
l fuel suppl
y system
High-tensio
n coil run out
Normal
ignition
system
Piston ring is worn to or even over its
wear limit
Spark Plug is not installed tight or is
without a gasket.
Tighten with a gasket in.
Air leakage between cylinder block and
cylinder head.
Check cylinder gasket, and the flatness of the
surface by which cylinder block contacting with
cylinder head
Tighten cylinder head bolts in stipulated order to
stipulated torque.
Air leakage in the valves
Check valve clearance and tightness, repair if
necessary.
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