Yamaha MBK MW125 2014, Service Manual

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ENGINE SPECIFICATIONS
2-2
EAS20014
ENGINE SPECIFICATIONS
Engine
Engine type Liquid cooled 4-stroke, SOHC
Displacement 124 cm³
Cylinder arrangement Single cylinder
Bore
×
stroke 52.4
×
57.9 mm (2.06
×
2.28 in)
Compression ratio 10.9 : 1
Standard compression pressure (at sea level) 1600 kPa/725 r/min (16.0 kgf/cm²/725 r/min,
227.6 psi/725 r/min)
Minimum–maximum 1392–1792 kPa/725 r/min (13.9–17.9
kgf/cm²/725 r/min, 198.0–254.9 psi/725 r/min)
Starting system Electric starter
Fuel
Recommended fuel Regular unleaded gasoline (Gasohol (E10)
acceptable)
Fuel tank capacity 6.6 L (1.74 US gal, 1.45 Imp.gal)
Engine oil
Lubrication system Wet sump
Recommended brand YAMALUBE
Type SAE 10W-40, 20W-40 or 20W-50
Recommended engine oil grade API service SG type or higher, JASO standard
MA or MB
Engine oil quantity
Quantity (disassembled) 0.90 L (0.95 US qt, 0.79 Imp.qt)
Periodic oil change 0.80 L (0.85 US qt, 0.70 Imp.qt)
Final transmission oil
Type YAMALUBE 10W-40 or SAE 10W-30 type SE
motor oil
Quantity 0.20 L (0.21 US qt, 0.18 Imp.qt)
Oil filter
Oil filter type Centrifugal
Oil pump
Oil pump type Trochoid
Inner-rotor-to-outer-rotor-tip clearance 0.150 mm (0.0059 in)
Limit 0.23 mm (0.0091 in)
Outer-rotor-to-oil-pump-housing clearance 0.13–0.18 mm (0.0051–0.0071 in)
Limit 0.25 mm (0.0098 in)
Cooling system
Recommended antifreeze YAMAHA GENUINE COOLANT only
Radiator capacity (including all routes) 0.37 L (0.39 US qt, 0.33 Imp.qt)
Coolant reservoir capacity (up to the maximum level
mark) 0.33 L (0.35 US qt, 0.29 Imp.qt)
Radiator cap opening pressure 93.3–122.7 kPa (0.93–1.23 kgf/cm², 13.5–17.8
psi)