Yamaha MIO Service Manual page 25

Item
Valve springs
Free length
Intake
Exhaust
Installed length (valve closed)
Intake
Exhaust
Compressed spring force (installed)
Intake
Exhaust
Spring tilt
Intake
Exhaust
Winding direction (top view)
Intake
Exhaust
Cylinder
Bore
Max. taper
Max. out-of-round
Warp limit
ENGINE SPECIFICATIONS
Standard
35.44 mm (1.40 in)
35.44 mm (1.40 in)
24.1 mm (0.95 in)
24.1 mm (0.95 in)
146 ~ 168 N
(14.9 ~ 17.1 kgf, 32.8 ~ 37.7 lb)
146 ~ 168 N
(14.9 ~ 17.1 kgf, 32.8 ~ 37.7 lb)
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Clockwise
Clockwise
50.000 ~ 50.010 mm (1.9685 ~ 1.9689 in)
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2 - 5
SPEC
Limit
34.00 mm
(1.34 in)
34.00 mm
(1.34 in)
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2.5°/1.5 mm
(2.5°/0.06 in)
2.5°/1.5 mm
(2.5°/0.06 in)
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0.05 mm
(0.0020 in)
0.05 mm
(0.0020 in)
0.05 mm
(0.0020 in)