Honda CB250 Nighthawk Owner's Manual page 105

Spark Plugs
4. Inspect the electrodes and center
porcelain for deposits, corrosion, or
carbon fouling. If the corrosion or
deposits are heavy, replace the plug.
Clean a carbon or wet-fouled plug with
a plug cleaner, if available, or a wire
brush.
5. Check the spark plug gap ( ) of each
new plug, using a wire-type feeler
gauge. If adjustment is necessary, bend
the side electrode ( ) carefully.
The gap should be:
0.024 0.028 in (0.60 0.70 mm)
96
Servicing Your Honda
1
2
(1)
(1) spark plug gap
6. With the plug washers attached, thread
the spark plugs in by hand to prevent
cross-threading.
(2)
(2) side electrode