Honda Marine BF40A Owner's Manual page 111

13. SPECIFICATIONS
BF40A&BF50A Tuneup
Spark plug gap
Idle speed
Valve clearance (cold)
Other snecifications
0.024 - 0.028 in (0.6 - 0.7 mm) See page 93.
950 f 50 rpm See shop manual.
Intake: 0.15 f 0.02 mm See shop manual.
Exhaust: 0.23 f 0.02 mm
No other adjustments needed.
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