Adjusting The Carburetor; Checking The Spark Plug - Honda Power Equipment UMK425E Manual Del Usuario

SHARPENING
3-TOOTH AND 4-TOOTH BLADES
Sharpening is essential to obtain good results.
A slightly blunt cutting attachment can be sharpened with a file.
A grinding wheel should be used if the wear is more severe.
CAUTION:
• In all cases, the cutting attachment must be kept correctly
balanced. If you do not have the required tools or if you think your
cutting attachment may not be properly balanced, contact your
authorized Honda dealer.
Remove the cutting attachment for sharpening and check that it is
not cracked, out of true or bent.
If it is, replace it with a new one.
Both sides of 3-tooth and 4-tooth blades can be used.
When one side is worn, the cutting attachment should be turned
over to use the cutting edges on the other side.
Only the bevelled edges of the teeth are to be sharpened.
It is important to keep their profile regular and to avoid incipient
fractures.
All the teeth must be sharpened in the same way.
NOTE : If the machine vibrates abnormally after sharpening, this
indicates that the blade is unbalanced. In this case, contact your
authorized dealer Honda to have it checked.
CAUTION:
• Replace the blade when the wear limit shown in the illustrations
below has been reached.
[A] Unsatisfactory
[1] Incipient fracture
[2] Limit exceeded and
tooth profile irregular
[3] Angles incorrect and unequal
[4] Unsatisfactory cutting profile
[B] Satisfactory
[5] Sharpening limit
CIRCULAR SAW BLADE
A circular saw blade can be
sharpened using a file [6] if it is
only slightly worn. It is very
important to keep the correct
tooth profile, as well as cutting
angles and tooth pitch [3].
If a more extensive sharpening is
required, contact your authorised
Honda dealer who has acccess
to suitable specialist sharpening
equipment.
908697Z_HONDA_GB.indd 9
C13
D2 D3
SAFETY
[2]
[1]
[A]
[3]
[4]
30 mm
[5]
[B]
30° 30°
30° 30°
[3]
[6]
1 mm
1 mm

ADJUSTING THE CARBURETOR

PROCEDURE
Start the engine and let it warm up to normal operating temperature.
Then turn the idle screw [7] to the right or left to obtain the correct
setting.
[7]
Idle speed
NOTE : When the engine is idling, the cutting attachment must not
rotate.

CHECKING THE SPARK PLUG

1. To reach the spark plug [8],
the top cover must be
removed from the
engine [9]. Use the
hexagonal wrench supplied
to undo the bolt [10].
NOTE : Hot parts and moving parts (flywheel) are exposed when the
engine top cover is removed. Never use your brushcutter with the
engine cover removed.
2. Remove the cap and unscrew the spark plug using the wrench
supplied.
3. Clean the electrodes with a wire brush [11] to remove carbon
deposits.
4. If the electrodes show signs of wear, replace the spark plug with
a new one with the same characteristics.
5. Check the spark plug gap with
feeler gauges [12]. When
adjustment is required, carefully
bend the side electrode.
6. Reinstall the spark plug and
screw it finger-tight onto its seat.
7. For new spark plugs, tighten by
an additional 1/2 turn with the
spark plug wrench.When the
same spark plus is installed, 1/8
to 1/4 of a turn is enough.
CAUTION:
• If a spark plug is insufficiently tightened, it is liable to heat up
and damage the engine. If the spark plug is overtightened or
crossthreaded, irreparable damage could be caused to the
engine block.
UMK425E UMK435E
3 100 ± 200 rpm
B7 C1
SAFETY
[8] [9]
[10]
[11]
0,6-0,7 mm
[12]
9 EN
18/07/12 15:30