Yamaha XG250, Service Manual

Page: 18 / 278

ENGINE SPECIFICATIONS
2-2
ENGINE SPECIFICATIONS
Engine
Engine type Air cooled 4-stroke, SOHC
Displacement 249.0 cm
3
(15.19 cu.in)
Cylinder arrangement Forward-inclined single cylinder
Bore
×
stroke 74.0
×
58.0 mm (2.91
×
2.28 in)
Compression ratio 9.50 :1
Standard compression pressure (at sea level) 1200 kPa/300 r/min (170.7 psi/300 r/min)
(12.0 kgf/cm
2
/300 r/min)
Starting system Electric starter
Fuel
Recommended fuel Regular unleaded gasoline only
Fuel tank capacity 6.0 L (1.59 US gal) (1.32 Imp.gal)
Fuel reserve amount 1.9 L (0.50 US gal) (0.42 Imp.gal)
Engine oil
Lubrication system Wet sump
Type SAE10W30 or SAE10W40 or SAE15W40 or
SAE20W40 or SAE20W50
Recommended engine oil grade API service SE, SF, SG type or higher
Engine oil quantity
Total amount 1.40 L (1.48 US qt) (1.23 Imp.qt)
Without oil filter element replacement 1.20 L (1.27 US qt) (1.06 Imp.qt)
With oil filter element replacement 1.30 L (1.37 US qt) (1.14 Imp.qt)
Oil filter type Wire mesh
Oil pump
Oil pump type Trochoid
Inner-rotor-to-outer-rotor-tip clearance 0.150 mm (0.0059 in)
Limit 0.20 mm (0.0079 in)
Outer-rotor-to-oil-pump-housing clearance 0.010 – 0.034 mm (0.0004 – 0.0013 in)
Limit 0.050 mm (0.0020 in)
Oil-pump-housing-to-inner-and-outer-rotor clearance 0.04 – 0.09 mm (0.0016 – 0.0035 in)
Limit 0.15 mm (0.0059 in)
Pressure check location HEAD CYLINDER
Spark plug (s)
Manufacturer/model NGK/DR7EA
Spark plug gap 0.6
–
0.7 mm (0.024
–
0.028 in)
Cylinder head
Volume 20.50
–
21.50 cm
3
(1.25
–
1.31 cu.in)
Warpage limit 0.03 mm (0.0012 in)