114
On the 6 H.P. engine, it
is
set in the center
of
the hex
nut
that
holds the bowl in place. On the
7 H.P. engine it
is
on
top'of
the carburetor.
Power adjustment screw A regulates the fuel-
to
air
mixture
for
high
speed
or
power. If the
mixture
is
too
rich
or
too
lean,
no
engine will run
properly. An engine
cannot
develop
all
of
its
power
unless
it
is
properly
adjusted. Keep the
tHrottle wide open
during
adjustment.
Therefore, adjust A by
turning
it
to the right,
clockwise
(see Photo
7/50\
one-eighth
to
one-
quarter
(Va
to
'!4)
turn
more
for
a leaner
mixture
...
or
to
the left,
counter-clockwise
one-eighth
to
one-quarter
(Va
to
'!4)
turn
for
a
richer
mixture.
Please remember
to
pause
for
10 to 15 seconds
after each adjustment
to
determine
how
the last
adjustment changed engine operation.
If
your
engine seems to have enough power
before you start
tilling,
and then loses
power
the
minute you engage the tines deeply in the soil,
it
probably
means that you have
to
open the
po-
wer adjustment screw
with
about
a
'!4
to
V2
turn
(counter-clockwise).
ADJUSTING THE POWER ADJUSTMENT
SCREW
To determine the
proper
power
adjustment
screw setting, run the engine at full
power
(without
choke engagement) and open the
pow-
e~
adjustment screw
(A
in Photo
7/50
or
7/51).
counter-clockwise
until you see black smoke
or
notice the engine
"coughing."
Then,
counting
the
number
of
turns,
turn
the screw back
to-
wards lean (clockwise)
until
the engine slows
down·or sputters. Then,
go
back
counter-clock-
wise half way between the
two
positions. That
final position,
or
Y2
turn
further
counter-clock-
wise, should be the
proper
setting
for
tilling.
YbLJ
might
find in actual
tilling
that
you still
have
to
open
up
the screw another
V2
turn
for
enough power.
But
don't
run the engine so
rich-
ly that it
smokes-normally,
you
won't
even see
the exhaust.
IDLE SPEED ADJUSTMENT
To
increase the
idling
speed
of
the engine,
turn
screw C
to
the
right.
Turn
it
to the
leftto
de-
crease idle speed (see C in Photo
7/50
or
7/51).
(Photo 7/51) 7 HP
engine
carburetor.
IF YOUR ENGINE WON'T START
When you can't start
your
engine
to
readjust
the carburetor, you should return the
power
ad-
justment screw back
gently
to
the original set-
ting
as
described on page 115.
(Photo 7/52) Turn
clockwise
to
lean
fuel
mixture.
To Next Page
Loading...
Need help?
General
