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CARURETOR ADJUSTMENT
The idle speed of the engine isadjustable, An idle adjust
ment screw ison the rear side of the carburetor (Fig. 22),
NOTE:Careless adjustments can seriously damage
your unit. An authorized service dealer should make
carburetor adjustments_
CLEAN AtR FILTER
The condition of the air filter isimportant to the op -
eration of the unit A dirty or oil saturated air filter wilt
restrict air flow, This is often mistaken for an out of ad -
justment carburetor. Check the condition of the air filter
before adjusting the idle speed screw. Referto Cleaning
Air Filter (p, 13)o
ADJUST IDLE SPEED SCREW
If,after checking the fuel and cleaning the air filter, the
engine still will not idle, adjust the idle speed screw as
follows:
10Startthe engine and let it run at a high idle for a min -
ute to warm upoRefer to StartinglStopping (p. I0)
instructions,
2 Release the throttle trigger and let the engine idle If
the engine stops, use asmall phillips or fiat blade to
turn the idle speed screw in, clockwise, 118of a turn
at atime (as needed) until the engine idles smoothly
NOTE:The cutting attachment should not rotate when
the engine idles°
Idle Adjustment
Screw
3 If the cutting attachment rotates when the engine
idles, turn the idle speed screw counterclock_wise
1/8 of a turn at atime (as needed), to reduce idle
speed, Checking the fuel, cleaning the air filter, and
adjusting the idle speed should solve most engine
problems, If not and all of the following are true:
- the engine will not idle
• the engine hesitates or stalls on acceleration
.there is aloss of engine power
Check the spark plug for proper gap and condition If
problem still occurs, have the carburetor adjusted by an
authorized service dealer.
REPLACING THE SPARK PLUGS
Use a replacement part number NGKCMR6A.The cor -
rect air gap is 0.02 in, (0,5 ram), Remove the plug after
every 25 hours of operation and check its condition°
1.Stop the engine and allow it to cool, Remove the
spark plug cover, Grasp the plug wire firmly and pull
the cap from the spark plug..
ZClean dirt from around the spark plug Remove the
spark plug from the cylinder head by turning a 5/8 in,
socket counterclockwise°
3Replace cracked, fouled or dirty"spark plug. Set the air
gap at 002 in, (0,5 ram,) using afeeler gauge (Fig 23),
&install acorrectly-gapped spark plug in the cylinder
head,Turn the 518 in. socket clockwise until snug,
If using a torque wrench torque to: 1IO-120 in, Ib
(12.3-13.,5N-m)
NOTE:Do not over tighten,
I
14
Fig 22
WARNING:
DO NOT SAND BLAST_ SCRAPE, OR
CLEAN SPARK PLUG ELECTRODES,
GRIT IN THE ENGINE COULD DAMAGE
THE CYLINDER
&02 in.
{0,5 ram}
Fig,23
LEHR] ALL RIGHTS RESERVED 2008-2009
,J
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