A-7
Crankcase assembly
Model F450A/XF450 FL450A/XF450 F400A/XF400 FL400A/XF400
Cylinder
Bore 96.000–96.012 mm (3.7795–3.7800 in)
Limit 96.072 mm (3.7824 in)
Piston
Diameter 95.945–95.960 mm (3.7774–3.7779 in)
Limit 95.905 mm (3.7758 in)
Measuring point 14.5 mm (0.57 in)
Piston clearance 0.040–0.067 mm (0.0016–0.0026 in)
Limit 0.167 mm (0.0066 in)
Ring groove (Top) 1.22–1.25 mm (0.0480–0.0492 in)
Ring groove (2nd) 1.22–1.24 mm (0.0480–0.0488 in)
Ring groove (Oil) 2.51–2.53 mm (0.0988–0.0996 in)
Pin boss inside diameter 22.011–22.018 mm (0.8666–0.8668 in)
Limit 22.038 mm (0.8676 in)
Pin outside diameter 21.996–22.005 mm (0.8660–0.8663 in)
Limit 21.986 mm (0.8656 in)
Piston ring (Top)
Type Barrel
Height (B) 1.170–1.185 mm (0.0461–0.0467 in)
Width (T) 2.800–3.000 mm (0.1102–0.1181 in)
End gap 0.20–0.30 mm (0.0079–0.0118 in)
Limit 0.470 mm (0.0185 in)
Side clearance 0.03–0.08 mm (0.0014–0.0032 in)
Limit 0.130 mm (0.0051 in)
Piston ring (2nd)
Type Taper
Height (B) 1.170–1.190 mm (0.0461–0.0469 in)
Width (T) 3.800–4.000 mm (0.1496–0.1575 in)
End gap 0.60–0.75 mm (0.0236–0.0295 in)
Limit 0.900 mm (0.0354 in)
Side clearance 0.03–0.07 mm (0.0012–0.0028 in)
Limit 0.110 mm (0.0043 in)
Piston ring (Oil)
Height (B) 2.410–2.470 mm (0.0949–0.0972 in)
Width (T) 2.350–2.750 mm (0.0925–0.1083 in)
Model F450A/XF450 FL450A/XF450 F400A/XF400 FL400A/XF400
End gap 0.15–0.60 mm (0.0059–0.0236 in)
Side clearance 0.04–0.12 mm (0.0016–0.0047 in)
Connecting rod
Small end inside diame-
ter
22.008–22.025 mm (0.8665–0.8671 in)
Big end inside diameter 65.990–66.010 mm (2.5980–2.5988 in)
Big end side clearance 0.140–0.310 mm (0.0055–0.0122 in)
Limit 0.36 mm (0.0142 in)
Big end oil clearance 0.026–0.049 mm (0.0010–0.0019 in)
Limit 0.079 mm (0.0031 in)
Crankshaft
Journal diameter 72.976–72.996 mm (2.8731–2.8739 in)
Crankshaft pin diameter 62.980–63.000 mm (2.4795–2.4803 in)
Runout 0.03 mm (0.0012 in)
Limit 0.04 mm (0.0016 in)
Crankshaft pin width 21.00–21.10 mm (0.8268–0.8307 in)
Journal oil clearance 0.029–0.053 mm (0.0011–0.0021 in)
Limit 0.073 mm (0.0029 in)
Lower unit technical data
Lower unit assembly (regular rotation model)
Lower unit
Holding pressure
68.6 kPa
(0.69 kgf/cm²,
9.9 psi)
—
68.6 kPa
(0.69 kgf/cm²,
9.9 psi)
—
Gear backlash
Forward gear backlash
0.13–0.50 mm
(0.0051–
0.0197 in)
—
0.13–0.50 mm
(0.0051–
0.0197 in)
—
Reverse gear backlash
0.39–0.83 mm
(0.0154–
0.0327 in)
—
0.39–0.83 mm
(0.0154–
0.0327 in)
—
Available shim thicknesses
Pinion shims
0.10/0.12/0.15/
0.18/0.30/0.40/
0.50 mm
—
0.10/0.12/0.15/
0.18/0.30/0.40/
0.50 mm
—
Forward shims
2.00/2.03/2.06/
2.09/2.12/2.15/
2.18/2.21 mm
—
2.00/2.03/2.06/
2.09/2.12/2.15/
2.18/2.21 mm
—
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