B.
IF
You find
dirt
or
bits
of
metal
There
is
a flaw in
either diaphragm
or
the
check
valve sheet
The fuel inlet valve
(needle and
seat)
is
damaged
The
mountingflange
is
warped
MUFFLER INSPECTION
IF
It
appean
to
be
clogged
with
deposits
You
can hear loose
metal pieces
or
silencing material
when
you
shake
the
muffler
C.
CRANKCASE PRESSURE CHECK
The
pressure leaks
at
a rate greater
than
llb./min.
STAGE III
TROUBLESHOOTING -CONTINUE,D
Remove, disassemble and inspect
the
carburetor.
The carburetor will cause engine
flooding (wash clean).
The carburetor may
not
deliver
enough fuel and
the
engine will
run
hot
or
perhaps will
not
start
at
all
(replace damaged
parts).
The fuel will
not
be controlled
and
the
engine will be flooded.
Air will leak into
the
intake
port
and cause a lean mixture
(surface grind
the
flange).
Remove
the
muffler.
The engine will
not
produce
normal horsepower and may over·
heat (clean
out
the muffler).
The engine will
not
produce nor·
mal horsepower and may overheat
(replace
or
repair
the
muffler).
Seal
the
intake and exhaust ports
and connect a pressure checking
device. Pressurize
the
engine
to
10
p.s.i.
The air/fuel mixture will become
lean enough
to
be
noticed
as
a
"hot"
plug reading. The machine
will suffer from short plug life.
The air/fuel mixture may become
lean enough
to
cause preignition,
detonation, and perhaps melting
of
the
piston crown.
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