Yamaha YZF-R125 Service Manual: Assembling the crankcase

Yamaha YZF-R125 Service Manual / Engine / Crankcase / Assembling the crankcase

1. Thoroughly clean all the gasket mating surfaces and crankcase mating surfaces.

2. Apply:

  • Sealant (onto the crankcase mating surfaces)

NOTE:

Do not allow any sealant to come into contact with the oil gallery.

Assembling the crankcase


3. Install:

  • Right crankcase

NOTE:

Turn the shift drum segment "1" to the position shown in the illustration. In this position, the shift drum segment teeth will not contact the crankcase during crankcase installation.

Assembling the crankcase


4. Install:

  • Crankcase bolts

NOTE:

Tighten each bolt 1/4 of a turn at a time, in stages and in the proper sequence as shown.

  • M6 × 70 mm : "7-9", "11"
  • M6 × 55 mm : "14", "15"
  • M6 × 45 mm : "1-5", "10"

Assembling the crankcase


A. Left crankcase

B. Right crankcase

    Installing the bearing retainer
    1. Install: Bearing retainer "1" NOTE: Install the bearing retainer "1" with its "OUT" mark "a" facing outward. Apply locking agent (LOCTITE) to the threads of the bearing retainer bo ...

    Crankshaft
    ...

    Other materials:

    Checking the clutch housing
    1. Check: Clutch housing dogs "1" Damage/pitting/wear  Deburr the clutch housing dogs or replace the clutch housing. NOTE: Pitting on the clutch housing dogs will cause erratic clutch operation. 2. Check: Bearing Damage/wear Replace the bearing and clutch housin ...

    Checking the crankshaft
    1. Measure: Crankshaft runout Out of specification Replace the crankshaft, bearing or both. NOTE: Turn the crankshaft slowly. 2. Measure: Big end side clearance Out of specification Replace the crankshaft. 3. Measure: Crankshaft width Out of specification&nbs ...

    Assembling the main axle and drive axle
    1. Install: Toothed washer "1" Circlip "2" NOTE: Be sure to install the circlip so that its sharp edge "a" is facing away from the toothed washer and gear. Be sure the circlip ends "b" are positioned at the axle spline groove "c". 2. Install: 2nd pinion gear "1" NO ...

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