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1-9

SPEC

Specification

(*1) The figures are for reference only.

Lower unit technical data

Lower unit assembly

Connecting rod

Small end inside diameter mm (in) 15.015–15.029 (0.5911–0.5917)

Big end inside diameter mm (in) 28.000–28.015 (1.1024–1.1030)

Oil clearance mm (in) 0.016–0.046 (0.0006–0.0018)

Crankshaft

Runout mm (in) 0.020 (0.0008)

Journal diameter (cylinder

block side)

mm (in) 24.980–24.993 (0.9835–0.9840)

Journal diameter (crankcase

side)

mm (in) 24.982–24.994 (0.9835–0.9840)

Crankpin diameter mm (in) 27.969–27.984 (1.1011–1.1017)

Crankpin width mm (in) 21.000–21.100 (0.8268–0.8307)

Valve lifter

Outside diameter mm (in) 7.965–7.980 (0.3136–0.3142)

Item Unit

Model

F4BMH F5AMH F6CMH

Lower unit

Holding pressure

kPa (kgf/

, psi)

98.0 (0.98, 14.2)

Propeller shaft

Runout mm (in) 0.02 (0.001)

Drive shaft

Runout mm (in) 0.4 (0.02)

Item Unit

Model

F4BMH F5AMH F6CMH

Yamaha F4B Service Manual

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