Yamaha SR125 Service Manual download pdf (Page 134)

4-54

CRANKCASE AND CRANK SHAFT

ENG

NOTE:

T******

CRANKSHAFT INSPECTION

1. Measure:

 Crankshaft runout

Out of specification  Replace crankshaft

and/or bearing.

Measure the crankshaft runout with the crank-

shaft assembly turning slowly.

Runout limit:

0.03 mm

2. Measure:

 Big end side clearance

Out of specification  Replace big end bear-

ing, crank pin and/or connecting rod.

Big end side clearance:

0.35  0.65 mm

Limit

0.1 mm

3. Measure:

 Crank width

Out of specification  Replace crankshaft.

Crank width:

55.95  56.00 mm

4. Inspect:

 Timing chain sprocket

Wear/Damage  Replace crankshaft.

 Bearing

Wear/Crack/Damage  Replace crank-

shaft.

5. Inspect:

 Crankshaft journal

Clogged  Blow out the journal with com-

pressed air.

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Ruchira 26 Jul 2025 | 07:58:41

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Yamaha SR125 Service Manual Page 134