Honda 1997 Prelude Owner's Manual page 162

Specifications:
NGK: PZFR6F-11
DENSO: PKJ20CR-L11
Spark Plug Gap:
0.043 in (1.1mm
Battery
Check the condition of your car's
battery monthly. You should check
the color of the test indicator window,
and for corrosion on the terminals.
)
Spark Plugs, Battery
TEST INDICATOR WINDOW
Check the battery condition by
looking at the test indicator window
on the battery.
The label on the battery explains the
test indicator's colors.
Maintenance
CONTINUED