Yamaha Fascino 2021, Supplementary Service Manual

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MAINTENANCE SPECIFICATIONS (ENGINE)
2-3
SPEC
Valve, valve seat, valve guide
Valve clearance (cold)
Intake 0.06–0.10 mm (0.0024–0.0039 in)
Exhaust 0.22–0.26 mm (0.0087–0.0102 in)
Valve dimensions
Valve seat contact width limit (intake) 1.4 mm (0.06 in)
Valve seat contact width limit (exhaust) 1.7 mm (0.07 in)
Valve stem diameter limit (intake) 4.945 mm (0.1947 in)
Valve stem diameter limit (exhaust) 4.930 mm (0.1941 in)
Valve guide inside diameter (intake) 5.000–5.012 mm (0.1969–0.1973 in)
Valve guide inside diameter (exhaust) 5.000–5.012 mm (0.1969–0.1973 in)
Valve-stem-to-valve-guide clearance limit
(intake) 0.080 mm (0.0032 in)
Valve-stem-to-valve-guide clearance limit
(exhaust) 0.100 mm (0.0039 in)
Valve stem runout 0.020 mm (0.0008 in)
Valve spring
Free length limit (intake) 35.30 mm (1.39 in)
Free length limit (exhaust) 35.30 mm (1.39 in)
Cylinder
Bore 52.400–52.423 mm (2.0630–2.0639 in)
Wear limit 52.473 mm (2.0659 in)
Piston
Diameter 52.377–52.400 mm (2.0621–2.0630 in)
Measuring point (from piston skirt bottom) 5.0 mm (0.20 in)
Piston-to-cylinder clearance 0.016–0.030 mm (0.0006–0.0012 in)
Piston pin bore inside diameter limit 13.043 mm (0.5135 in)
Piston pin outside diameter limit 12.976 mm (0.5109 in)
Piston ring
Top ring
End gap limit 0.42 mm (0.0165 in)
Side clearance limit 0.120 mm (0.0047 in)
2nd ring
End gap limit 0.67 mm (0.0264 in)
Side clearance limit 0.120 mm (0.0047 in)
Crankshaft
Crank assembly width 43.95–44.00 mm (1.730–1.732 in)
Runout limit 0.030 mm (0.0012 in)
Clutch
Clutch type Dry, centrifugal, shoe
B7JF8197E1.book Page 3 Tuesday, June 29, 2021 2:28 PM