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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Page 48
Image 48
Yamaha WR250FM service manual Silencer