TOHATSU BFT75A Service Manual page 93

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MAINTENANCE
CHECK
Visually inspect the spark plug. Replace the plug if it is
heavily fouled or the insulator [1] is cracked or chipped.
Check the following and replace if necessary.
– Insulator and sealing washer [2] for damage
– Center electrode [3] and side electrode [4] for wear
– Burning condition, coloration
RECOMMENDED SPARK PLUG:
Standard: ZFR6K-9E (NGK)
Optional (Iridium): IZFR6K-11E (NGK)
Measure the plug gap with a wire-type feeler gauge.
PLUG GAP:
Standard: 0.80 – 0.90 mm (0.031 – 0.035 in)
Optional (Iridium): 1.00 – 1.10 mm (0.039 – 0.043 in)
SERVICE LIMIT:
Optional (Iridium): 1.30 mm (0.051 in)
If the measurement is out of the specification, adjust by
Standard plug:
bending the side electrode.
If the gap is out of specification, replace the plug. Do
Optional iridium
plug:
not clean or adjust the plug gap.
INSTALLATION
A loose spark plug can become very hot and can
damage the engine. Overtightening the spark plugs can
damage the threads in the engine.
Install and hand tighten the spark plugs to the cylinder
head, and then tighten the spark plugs to the specified
torque.
TORQUE: 18 N·m (1.8 kgf·m, 13 lbf·ft)
Install the ignition coil and tighten the bolt.
Install the plug maintenance cover [1] and tighten the
bolt [2] to the specified torque.
TORQUE: 5 N·m (0.51 kgf·m, 3.7 lbf·ft)
Install the engine cover.
3-16
Standard:
[4] [3] [1] [2]
0.80 – 0.90 mm (0.031 – 0.035 in)
Optional (Iridium):
[3]
[4]
[1]
1.00 – 1.10 mm
(0.039 – 0.043 in)
[2]
[1]
[1]
[2]
[1]