Engine Specifications - Yamaha YZ250X 2022 Owner's Service Manual

EAM20128

ENGINE SPECIFICATIONS

Engine
Combustion cycle
Cooling system
Induction system
Displacement
Number of cylinders
Bore  stroke
Compression ratio
Starting system
Fuel
Recommended fuel
Fuel tank capacity
Fuel reserve amount
Engine oil
Recommended brand
Lubrication system
Engine oil
Premix ratio
Transmission oil
Type
Quantity (disassembled)
Quantity
Cooling system
Coolant quantity
Radiator (including all routes)
Radiator cap valve opening pressure
Spark plug(s)
Manufacturer/model
Spark plug gap
Cylinder head
Warpage limit
Cylinder
Bore
Wear limit
Piston
Piston-to-cylinder clearance
Diameter
Measuring point (from piston skirt bottom)
Piston pin bore inside diameter limit
Piston pin outside diameter limit
Piston-pin-to-piston-pin-bore clearance
Piston ring
Top ring
End gap limit
Ring side clearance
ENGINE SPECIFICATIONS
2-stroke
Liquid cooled
Reed valve
249 cm³
Single cylinder
66.4  72.0 mm (2.61  2.83 in)
7.9–9.4 : 1
Kickstarter
Premium unleaded gasoline (E10 acceptable)
8.0 L (2.1 US gal, 1.8 Imp.gal)
2.0 L (0.53 US gal, 0.44 Imp.gal)
YAMALUBE
Premix lubrication
YAMALUBE 2R
30
Motor oil SAE 10W-40 type SG or higher
0.80 L (0.85 US qt, 0.70 Imp.qt)
0.75 L (0.79 US qt, 0.66 Imp.qt)
1.20 L (1.27 US qt, 1.06 Imp.qt)
93.3–122.7 kPa (0.93–1.23 kgf/cm², 13.5–17.8
psi)
NGK/BR8EG
0.5–0.6 mm (0.020–0.024 in)
0.03 mm (0.0012 in)
66.400–66.414 mm (2.6142–2.6147 in)
66.464 mm (2.6167 in)
0.045–0.050 mm (0.0018–0.0020 in)
66.352–66.367 mm (2.6123–2.6129 in)
17.5 mm (0.69 in)
18.040 mm (0.7102 in)
17.975 mm (0.7077 in)
0.004–0.020 mm (0.0002–0.0008 in)
0.95 mm (0.0374 in)
0.030–0.065 mm (0.0012–0.0026 in)
2-2