KYMCO MXU 500i, Manual

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8.6. SPARK PLUG INSPECTION
The spark plug is an important engine component and is easy
to inspect. The condition of the spark plug can indicate the
condition of the engine.
For example, a very white center electrode porcelain color
could indicate an intake air leak or carburetion problem for that
cylinder. Do not attempt to diagnose such problems yourself.
Instead, take the machine to a KYMCO dealer. You should
periodically remove and inspect the spark plug because heat
and deposits will cause the spark plug to slowly break down
and erode.
If electrode erosion becomes excessive, you should replace
the spark plug with one of the proper type.
Standard spark plug (NGK): CR7E
Before installing the spark plug, measure the electrode gap
with a feeler gauge and adjust to specification.
Specification
Spark plug gap 0.7~0.8 mm (0.028~0.031 in)
(A) Spark plug gap
When installing the spark plug, always clean the gasket surface
and use a new gasket. Wipe off any grime from the threads and
tighten to the specified torque.
Tightening Torque
Spark plug 11.8N-m (1.2 kgf-m, 8.7 lbf-ft)