Yamaha yz250 2015, Owner'S Manual

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4-13
CYLINDER HEAD, CYLINDER AND PISTON
CYLINDER HEAD, CYLINDER AND PISTON
REMOVING THE CYLINDER HEAD AND CYLINDER
Order Part name Q'ty Remarks
Seat and fuel tank
Refer to "SEAT, FUEL TANK AND SIDE
COVERS" section.
Exhaust pipe and silencer
Refer to "EXHAUST PIPE AND SILENCER"
section.
Radiator hose 1 Disconnect at cylinder head side.
Carburetor
Refer to "CARBURETOR AND REED
VALVE" section.
1 Spark plug 1
2 Engine bracket 2
3 Nut (cylinder head) 6
Loosen each nut 1/4 turn, and remove them
after all nuts are loosened.
4 Cylinder head 1
5 Power valve housing 1
6 Push rod 1 Refer to removal section.
7 Nut (cylinder) 4
8 Cylinder 1
34 Nm (3.4 m kg, 24 ft lb)
64 Nm (6.4 m kg, 46 ft lb)
20 Nm (2.0 m kg, 14 ft lb)
5 Nm (0.5 m kg, 3.6 ft lb)
25 Nm (2.5 m kg, 18 ft lb)
13 Nm (1.3 m kg, 9.4 ft lb)
13 Nm (1.3 m kg, 9.4 ft lb)
42 Nm (4.2 m kg, 30 ft lb)
5 Nm (0.5 m kg, 3.6 ft lb)