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● Spark plug testing
·Make sure there is no spilled fuel outside the engine and that
the spark plug isn’t dipped with fuel.
· To prevent fire, keep sparks far away from the spark plug
mounting hole.
·When testing the spark plug, never hold the high tension line
of the spark plug and spark plug cap with wet hand.
· If having fuel cock, turn the fuel cock to “OFF”
position, (if no fuel cock, first drain the gasoline of the
fuel tank, then, drain the gasoline of the carburetor)
·Remove the spark plug and spark plug cap.
·Install the spark plug cap
·Turn the engine stop switch to“︱”or“STOP”position.
·Pass negative pole (thread) of the spark plug through cylinder cover to connect grounding and pull the
starter handle to observe the spark
4-1-2 Power lack
TROUBLE CAUSE REMEDY
Air in fuel line or fuel line
clogged
Exhaust air or dredge fuel line
Carburetor main fuel channel is not
adjusted properly
Readjust
In carburetor, needle valve hole
and main fuel channel clogged.
Clean and blow to get through
Fuel cock is clogged up. Clean, replace damaged part
Too much carbon fouling in
muffler and exhaust pipe.
Clear away
Too much carbon deposit in
combusting chamber.
Clear away
Air cleaner is clogged up. Clean air cleaner filter element
Ignition system
Fuel supply
system
Intake pipe is leaking Repair or replace
Intake pipe is leaking Repair or replace
Piston or cylinder or piston ring
is worn
Replace the worn parts
Air leakage from the surface by
which cylinder block contacting
with cylinder head.
Replace cylinder gasket
When increasing
throttle, speed
increase slow or
even decrease and
stop running
Poor
compression
Too big or too small valve
clearance.
Readjust
Spark plug
Spark plug cap
High tension line