Suzuki UF50 Service Manual page 18

2-6 PERIODIC MAINTENANCE
SPARK PLUG GAP
Measure the spark plug gap using a thickness gauge. If the spark
plug gap is out of specification, adjust the gap.
Spark plug gap
Standard: 0.6 – 0.7 mm
09900-20804: Thickness gauge
ELECTRODES
Check the condition of the electrodes.
If the electrode is extremely worn or burnt, replace the spark
plug with a new one.
Also, replace the spark plug if it has a broken insulator, dam-
aged threads, etc.
Check the tread size and reach when replacing the
spark plug. If the reach is too short, carbon will be de-
posited on the screw portion of the spark plug hole
and engine damage may result.
SPARK PLUG INSTALLATION
To avoid damaging the cylinder head threads; first, fin-
ger tighten the spark plug, and then tighten it to the
specified torque using the spark plug wrench.
Insert the spark plug and finger tighten it to the cylinder head
and then tighten it to the specified torque.
Spark plug: 28 N·m (2.8 kgf-m)
0.6 – 0.7 mm