Spark Plug; Replacement - Malaguti CENTRO SO 4T Service Manual

50 cc - 4 T

SPARK PLUG

REPLACEMENT

every 6,000 km
Remove the spark plug when the engine is cold.
Type of spark plug to be used: NGK CR8E - NGK CR8EB
• For maintenance, disassemble the central panel under the seat (P), remove the three fastening screws (V) 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 insulator 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 0,5 ÷ 0,6 mm.
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.
• Remove any residue, using jets of compressed air.
• Grease the sparkplug threads with motor oil and manually rescrew it.
• Tightening the spark plugs:
17,5
24 07/08
V
P
F. 40
C
F. 41