Denzel LD-420 - Spark Plug Maintenance; Troubleshooting

20
GASOLINE LAWN MOWER
EN
The lawn mower is equipped with an air lter to prevent ingress of airborne solid particles into the engine. The
lter needs periodic cleaning. Given heavy contamination, the ltering element shall be replaced.
1. Open the lter cover.
2. Remove the ltering element, and carefully wash it with unleaded petrol. Usage of solvents is prohibited!
3. Dry the ltering element completely.
4. Soak it with a little of oil (any surplus shall be squeezed out without twisting).
5. Put the air lter back in place and install the cover (make sure it is tightly tted to the housing).
Spark plug maintenance
After every 100 running hours of the engine, but at least once a year, check the spark plug as follows:
1. Clean the surface surrounding the spark plug.
2. Disconnect the high-voltage wire.
3. Wrench out the spark plug via the designated spanner belonging to the delivery set. The spark plug
electrodes shall be light-brown in color.
4. Replace the spark plug, if its ceramic isolator is chipped, or if electrodes are corroded, burnt, or fouled.
5. Clean the electrodes with a ne abrasive paper to the bright metal, check and adjust the gap.
6. Check the gap between the grounding and central electrodes by means of a special probe. At necessity,
set the gap to 0.7-0.8 m (Fig. 16).
7. Mount the spark plug back in place, and tighten until it stops. Insucient tightness of the spark plug can
lead to overheating and damage to the engine.
8. Connect the high-voltage wire.
0,7 – 0,8 mm
Fig. 16
TROUBLESHOOTING
Fault Possible reason Remedy
The engine does not start.
Ingress of foreign items into
the fuel tank.
Clean the fuel tank.
The fuel pipe is clogged Clean the fuel pipe.
Fuel is run out. Refuel.
Crank gear is worn. Contact an authorized service center.
Erratic operation of the
carburator.
Contact an authorized service center.
No sparking.
The spark plug is contaminated
or fouled.
Clean from dirt and soot; wipe dry.
The spark plug is damaged. Replace the spark plug.
Incorrect spark plug gap. Adjust the gap as per the manual.