Yamaha YZ450F(D) Owner's Service Manual page 36

Piston:
Piston to cylinder clearance
Piston size "D"
Measuring point "H"
Piston off-set
Piston pin bore inside diameter
Piston pin outside diameter
Piston rings:
Top ring:
Type
Dimensions (B × T)
End gap (installed)
Side clearance (installed)
2nd ring:
Type
Dimensions (B × T)
End gap (installed)
Side clearance
Oil ring:
Dimensions (B × T)
End gap (installed)
Item
MAINTENANCE SPECIFICATIONS
Standard
0.020–0.045 mm (0.0008–0.0018 in)
96.965–96.980 mm (3.8175–3.8181 in)
9.0 mm (0.35 in)
0 mm (0 in)
18.004–18.015 mm (0.7088–0.7093 in)
17.991–18.000 mm (0.7083–0.7087 in)
Barrel
1.00 × 3.30 mm (0.04 × 0.13 in)
0.20–0.30 mm (0.008–0.012 in)
0.015–0.065 mm (0.0006–0.0026 in)
Taper
1.00 × 3.10 mm (0.04 × 0.12 in)
0.35–0.50 mm (0.014–0.020 in)
0.020–0.060 mm (0.0008–0.0024 in)
1.5 × 2.55 mm (0.06 × 0.10 in)
0.20–0.50 mm (0.008–0.020 in)
2-6
Limit
0.1 mm (0.004
in)
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18.045 mm
(0.7104 in)
17.971 mm
(0.7075 in)
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0.55 mm (0.022
in)
0.120 mm
(0.005 in)
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0.85 mm (0.033
in)
0.120 mm
(0.005 in)
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