Specifications

2.Unsmooth rotation(Weak acceleration ; inefficient horsepower)
air cleaner blocked
fuel supply system abnormal
fuel tank cover blocked
muffler blocked
auto cock is malfunctioned
auto chock is malfunctioned
CDI unit is out of order
alternator flywheel magneto is
out of order
Valve clearance adjustment is
not correct.
Valve base is over worn out.
(Clearance valve is over extruded.)
cylinder, piston worn out.
cylinder gasket leakage.
valve base is malfunctioned
wrong valve timing
clean the carburetor
clean the dirt.
specification is not correct.
oil level is too high.
oil level is too low.
oil does not interchange.
oil route is blocked.
insufficient oil pumping from
oil pump.
piston and cylinder worn out.
mixture is too lean.
bad quality of the fuel.
too much carbon in the combustion room.
ignition timing is too early
too much carbon in the combustion room.
bad quality of the fuel.
clutch slip
mixture is too lean.
ignition timing is too early.
Check and Adjust
Trouble condition
The reason
start engine and open
throttle gradually.
check and inspect
engine can rotate
up
engine can’t rot-
ate up completely
Check ignition timing, check
with ignition timing lamp
Timing is correct
Timing is
not correct.
bad adjustment
on valve
Valve clearance is correct.
Valve clearance is incorrect
Check cylinder compression
pressure
(use cylinder compre-
ssion pressure gauge.
Pressure is normal.
Pressure is not normal
Check carburetor
Is blocked or not
No blocked
blocked
Remove spark
Plug and check it
No dirty and no
Color change
Dirty, color
change
Check the oil level in crankcase
Is too much or dirty
Oil level is
Normal.
Oil level is
Not normal.
Normal
Abnormal
Check the lubrication
Of cylinder head
Check engine overheat
Or not
Not overheat
overheat
Running accelerately or
High sp eed continuously
No knocking
knocking