Yamaha WR250FM service manual Part to be tightened Thread size ’ty Tightening torque

MAINTENANCE SPECIFICATIONS

SPEC

Part to be tightened	Thread size		Q’ty	Tightening torque
				Nm	m·kg	ft·lb
Spark plug	M10S ⋅ 1.0		1	13	1.3	9.4
Camshaft cap	M6	⋅ 1.0	10	10	1.0	7.2
Cylinder head blind plug screw	M12 ⋅ 1.0		1	37	3.7	27
Cylinder head (stud bolt)	M6	⋅ 1.0	2	7	0.7	5.1
(stud bolt)	M8 ⋅ 1.25		1	15	1.5	11
(bolt)	M9 ⋅ 1.25		4	38	3.8	27
(nut)	M6	⋅ 1.0	2	10	1.0	7.2
Cylinder head cover	M6	⋅ 1.0	2	10	1.0	7.2
Cylinder	M6	⋅ 1.0	1	10	1.0	7.2
Balancer weight	M6	⋅ 1.0	2	10	1.0	7.2
Balancer shaft driven gear	M14 ⋅ 1.0		1	50	5.0	36
Timing chain guide (intake side)	M6	⋅ 1.0	2	10	1.0	7.2
Timing chain tensioner	M6	⋅ 1.0	2	10	1.0	7.2
Timing chain tensioner cap bolt	M6	⋅ 1.0	1	7	0.7	5.1
Impeller	M8 ⋅ 1.25		1	14	1.4	10
Radiator hose clamp	M6	⋅ 1.0	8	2	0.2	1.4
Coolant drain bolt	M6	⋅ 1.0	1	10	1.0	7.2
Water pump housing	M6	⋅ 1.0	4	10	1.0	7.2
Radiator	M6	⋅ 1.0	6	10	1.0	7.2
Radiator guard	M6	⋅ 1.0	2	10	1.0	7.2
Radiator pipe	M6	⋅ 1.0	1	10	1.0	7.2
Oil pump cover	M4	⋅ 0.7	1	2	0.2	1.4
Oil pump	M6	⋅ 1.0	3	10	1.0	7.2
Oil filter element drain bolt	M6	⋅ 1.0	1	10	1.0	7.2
Oil filter element cover	M6	⋅ 1.0	2	10	1.0	7.2
Oil strainer	M6	⋅ 1.0	2	10	1.0	7.2
Oil delivery pipe 1 (M10)	M10	⋅ 1.25	1	20	2.0	14
(M8)	M8 ⋅ 1.25		2	18	1.8	13
Oil hose	M6	⋅ 1.0	2	10	1.0	7.2
Oil hose clamp		—	2	2	0.2	1.4
Oil strainer and frame	M14 ⋅ 1.5		1	70	7.0	50
Carburetor joint clamp	M4	⋅ 0.7	2	3	0.3	2.2
Air filter joint clamp	M6	⋅ 1.0	1	3	0.3	2.2
Throttle cable (pull)	M6	⋅ 1.0	1	4	0.4	2.9
Throttle cable (return)	M12 ⋅ 1.0		1	11	1.1	8.0
Throttle cable cover	M5	⋅ 0.8	2	4	0.4	2.9
Hot starter plunger	M12 ⋅ 1.0		1	2	0.2	1.4
Air filter case	M6	⋅ 1.0	2	8	0.8	5.8
Air filter joint and air filter case	M5	⋅ 0.8	1	4	0.4	2.9
Exhaust pipe (nut)	M8 ⋅ 1.25		1	13	1.3	9.4
(bolt)	M8 ⋅ 1.25		1	24	2.4	17
Exhaust pipe protector	M6	⋅ 1.0	3	10	1.0	7.2

2 - 10