Yamaha WR250FM service manual Silencer

MAINTENANCE SPECIFICATIONS

SPEC

Part to be tightened	Thread size		Q’ty	Tightening torque
				Nm	m·kg	ft·lb
Silencer	M8 ⋅ 1.25		2	35	3.5	25
Silencer clamp	M8 ⋅ 1.25		1	19	1.9	13
Spark arrester (for USA)	M6	⋅ 1.0	3	10	1.0	7.2
Silencer end pipe (for USA)	M6	⋅ 1.0	1	10	1.0	7.2
Crankcase	M6	⋅ 1.0	11	12	1.2	8.7
Crankcase bearing stopper	M6	⋅ 1.0	11	10	1.0	7.2
Crankcase bearing stopper (crankshaft)	M6	⋅ 1.0	4	10	1.0	7.2
Left crankcase cover	M6	⋅ 1.0	8	10	1.0	7.2
Idle gear cover (starter motor)	M6	⋅ 1.0	3	10	1.0	7.2
Idle gear plate	M6	⋅ 1.0	2	10	1.0	7.2
Right crankcase cover	M6	⋅ 1.0	8	10	1.0	7.2
Clutch cover	M6	⋅ 1.0	7	10	1.0	7.2
Crankcase oil drain bolt	M10	⋅ 1.25	1	20	2.0	14
Drive chain sprocket cover	M6	⋅ 1.0	2	8	0.8	5.8
Kick shaft ratchet wheel guide	M6	⋅ 1.0	2	12	1.2	8.7
Kickstarter crank	M8 ⋅ 1.25		1	33	3.3	24
Starter clutch	M6	⋅ 1.0	6	16	1.6	11
Primary drive gear	M18 ⋅ 1.0		1	75	7.5	54
Clutch spring	M6	⋅ 1.0	5	8	0.8	5.8
Clutch boss	M16 ⋅ 1.0		1	60	6.0	43
Push lever shaft	M6	⋅ 1.0	1	10	1.0	7.2
Drive sprocket	M18 ⋅ 1.0		1	75	7.5	54
Drive axle oil seal stopper	M6	⋅ 1.0	2	10	1.0	7.2
Segment	M8 ⋅ 1.25		1	30	3.0	22
Shift guide	M6	⋅ 1.0	2	10	1.0	7.2
Stopper lever	M6	⋅ 1.0	1	10	1.0	7.2
Shift pedal	M6	⋅ 1.0	1	12	1.2	8.7

NOTE:

- marked portion shall be checked for torque tightening after break-in or before each race.

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