Subaru EA190V, Service Manual

Page: 22 / 52

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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 recoil starter grip
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
Main oil flow hole is not
adjusted properly
Readjust
In carburetor, needle valve hole
and main oil flow hole clogged.
Clean and blow to get through
Fuel cock is clogged up. Clean, replace damaged part
Too much car bon 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
Ign
iti
on s
ys
te
m
Fue
l s
uppl
y s
ys
te
m
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
Air leakage from the surface by
which cylinder block contacting
with cylinder head.
Replace cylinder gasket
W
he
n i
nc
rea
si
ng t
hr
ottl
e,
s
pee
d i
nc
rea
se
sl
ow
o
r e
ve
n de
cr
ea
se
a
nd
st
op r
unni
ng
Poor
c
om
pre
ssi
on
Too big or too small valve
clearance.
Readjust
Spark plug
Spark plug cap
High tension line