Yamaha 50G, Руководство по обслуживанию

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2-5
SPEC
E
MAINTENANCE SPECIFICATIONS
C31000-0*
MAINTENANCE SPECIFICATIONS
ENGINE
Item Unit
Model
50 hp 60 hp 70 hp 75 hp 80 hp 90 hp
Cylinder head:
Warpage limit mm (in) 0.1 (0.004)
(Lines indicate straight
measurement)
Cylinder:
Bore size mm (in) 72.00 ~ 72.02
(2.834 ~ 2.835)
82.00 ~ 82.02
(3.228 ~ 3.229)
Taper limit mm (in) 0.08 (0.003)
Out of round limit mm (in) 0.05 (0.002)
Piston:
Piston to cylinder
clearance mm (in) 0.050 ~ 0.055
(0.0020 ~ 0.0022)
0.060 ~ 0.065
(0.0024 ~ 0.0026)
<Limit> mm (in) 0.105 (0.0041) 0.115 (0.0045)
Piston size “D” mm (in) 71.945 ~ 71.970
(2.8325 ~ 2.8335)
81.935 ~ 81.960
(3.2258 ~ 3.2268)
Measuring point “H” mm (in) 10 (0.4)
Oversize 1st mm (in) 72.25 (2.844)* 82.25 (3.238)*
2nd mm (in) 72.50 (2.854) 82.50 (3.248)
Offset mm (in) 0.5 (0.0197) 1.0 (0.039)
[direction] [Exhaust side] [Exhaust side]
Piston ring:
Sectional sketch
Top ring & 2nd ring
Type
Keystone
B mm (in) 2.0 (0.08)
T mm (in) 3.0 (0.12) 3.2 (0.13)
End gap [installed]
Top ring & 2nd ring mm (in) 0.3 ~ 0.5 (0.012 ~ 0.020) 0.4 ~ 0.6 (0.016 ~ 0.024)
Side clearance
Top ring & 2nd ring mm (in) 0.03 ~ 0.07
(0.0012 ~ 0.0028)
0.03 ~ 0.06
(0.0012 ~ 0.0024)
*: Except for USA