Yamaha 2003 yz85, Owner'S Service Manual

Page: 69 / 506

SPEC
2 - 4
MAINTENANCE SPECIFICATIONS
MAINTENANCE SPECIFICATIONS
ENGINE
Item Standard Limit
Cylinder head:
Combustion chamber capacity 7.14 cm
3
(0.25 Imp oz, 0.24 US oz)
----
Warp limit ---- 0.03 mm
(0.0012 in)
Cylinder:
Bore size 47.500 ~ 47.514 mm
(1.8701 ~ 1.8706 in) 47.6 mm
(1.8740 in)
Taper limit ---- 0.05 mm
(0.0020 in)
Out of round limit ---- 0.01 mm
(0.0004 in)
Piston:
Piston to cylinder clearance 0.040 ~ 0.045 mm
(0.0016 ~ 0.0018 in) 0.1 mm
(0.004 in)
Piston size “D” 47.457 ~ 47.472 mm
(1.8684 ~ 1.8690 in) ----
Measuring point “H” 20 mm (0.79 in) ----
Piston off-set 1.0 mm (0.039 in)/EX-side ----
Piston pin bore inside diameter 14.004 ~ 14.015 mm
(0.5513 ~ 0.5518 in) 14.040 mm
(0.5528 in)
Piston pin outside diameter 13.996 ~ 14.000 mm
(0.5510 ~ 0.5512 in) 13.975 mm
(0.5502 in)
Piston ring:
Type Plain ----
Dimensions (B
×
T) 0.8
×
2.0 mm (0.031
×
0.079 in) ----
End gap (installed) 0.30 ~ 0.45 mm
(0.012 ~ 0.018 in) 0.80 mm
(0.031 in)
Side clearance (installed) 0.030 ~ 0.065 mm
(0.001 ~ 0.003 in) 0.1 mm
(0.004 in)
B
T