Honda CB400 SUPER FOUR Owner's Manual page 143

05/03/25 12:12:07 32MCE610_143
ENGINE
Bore and stroke
Compression ratio
Displacement
Spark plug
Standard
For extended high speed
riding
Idle speed
Valve clearance (Cold)
55.0 × 42.0 mm (2.17 × 1.65 in)
11.3 : 1
399.1 cm (24.35 cu-in)
CR8EH-9 (NGK) or
U24FER9 (DENSO)
CR9EH-9 (NGK) or
U27FER9 (DENSO)
1,350 ± 100 min (rpm)
Intake 0.20 mm (0.008 in)
Exhaust 0.27 mm (0.011 in)
133