25 03/09
125 - 160 cc
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F. 3 6
F. 3 5
C
P
V3
Spark plugs with a thermal grade that is different than that deduced by the advised
symbols may seriously damage the engine.
Replace all spark plug with cracks on the insulator or corroded electrodes.
SPARK PLUG
REPLACEMENT
Remove the spark plug when the engine is cold.
Type of spark plug to be used: NGK DPR7EA9
• For maintenance, disassemble the central panel under the seat (P), remove the
fastening screws (V3) and lift the internal profile (with the help of a screwdriver)
that is held on two lugs in the foot rest board, carefully extract the hood (C ),
with small clockwise and anti clockwise movements; then unscrew the spark
plug.
• Examine the condition of the sparkplug. Deposits and colorations of the insula-
tor provide useful information on the thermal grade, on the carburetion, on the
lubrication and on the general condition of the engine. If there is a light brownish
color on the insulator around the central electrodes, it means that it functions properly.
• After removing the sparkplug, proceed to clean thoroughly the electrodes and insulators, using a
metallic brush. Adjust the electrode gap, using a laminar feeler gauge: the gap must be 0,6 ÷ 0,7 mm
• Remove any residue, using jets of compressed air.
• Grease the sparkplug threads with motor oil and manually rescrew it.
• Tightening the spark plugs:
every 12,000 km
17,5
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