Yamaha F100B F100C Outboards Factory Service Manual, Page 124Get this manual
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Power unit
Cam lobe a: Intake: 37.2237.38 mm (1.46541.4716 in) Exhaust: 36.9037.06 mm (1.45281.4590 in) Cam lobe b: Intake: 29.9230.08 mm (1.17801.1842 in) Exhaust: 29.9230.08 mm (1.17801.1842 i