Maintenance Specification; Engine - Yamaha YFM250X 2002 Supplementary Service Manual

MAINTENANCE SPECIFICATIONS

ENGINE

Cylinder head:
Warp limit
*
Measuring point
Piston:
Piston to cylinder clearance
Piston size "D"
Measuring point "H"
Oversize
Oversize
Piston off-set
Piston off-set direction
Piston pin bore inside diameter
Piston pin outside diameter
Lubrication system:
Oil filter type
Oil pump type
Tip clearance "A" or "B"
Side clearance
Bypass valve setting pressure
Oil pressure (hot)
Pressure check location
MAINTENANCE SPECIFICATIONS
Item
H
D
2nd
4th
Standard
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Lines indicate straightedge
measurement.
0.04 ~ 0.06 mm
(0.0016 ~ 0.0024 in)
70.92 ~ 70.97 mm
(2.792 ~ 2.794 in)
4.0 mm (0.16 in) from bottom line
of piston skirt
71.5 mm (2.81 in)
72 mm (2.83 in)
0.5 mm (0.02 in)
Intake side
16.002 ~ 16.013 mm
(0.6300 ~ 0.6304 in)
15.991 ~ 16.000 mm
(0.6296 ~ 0.6299 in)
Wire mesh
Trochoid type
0.15 mm (0.006 in)
0.04 ~ 0.09 mm
(0.002 ~ 0.004 in)
80 ~ 120 kPa
2
(0.8 ~ 1.2 kg/cm
52 kPa (0.52 kg/cm², 7.5 psi) at
7,500 r/min
Element cover
– 2 –
SPEC
0.03 mm
(0.001 in)
0.15 mm
(0.0059 in)
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0.20 mm
(0.008 in)
0.09 mm
(0.004 in)
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, 11 ~ 17 psi)
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Limit