Honda Del Sol 1997 Reference Owner's Manual page 146

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5. Put the new spark plug into the
socket; then screw it into the hole.
Screw it in by hand so you do not
crossthread it.
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6. Torque the spark plug. (If you do
not have a torque wrench, tighten
the spark plug two-thirds of a turn
after it contacts the cylinder head.)
Tightening torque:
13 lbf.ft (1.8 kgf.m, 18 N.m)
Spark Plugs
NOTICE
Tighten the spark plugs carefully. A
spark plug that is too loose can
overheat and damage the engine.
Overtightening can cause damage to
the threads in the cylinder head.
7. Install the spark plug cap.
8. Repeat this procedure for the
other three spark plugs.
(VTEC)
Reinstall the plug wire cover and
tighten the four nuts.
Maintenance
CONTINUED