Yamaha YZF-R125 Service Manual: Removing the piston

Removing the piston


1. Remove:

  • Piston pin clips "1"

  • Piston pin "2"

  • Piston "3"

CAUTION:

Do not use a hammer to drive the piston pin out.

NOTE:

  • Before removing the piston pin clip, cover the crankcase opening with a clean rag to prevent the piston pin clip from falling into the crankcase.

  • Before removing the piston pin, deburr the piston pin clip groove and the piston pin bore area.

    If both areas are deburred and the piston pin is still difficult to remove, remove it with the piston pin puller set "4".


Removing the piston


2. Remove:

  • Top ring

  • 2nd ring

  • Oil ring

NOTE:

When removing a piston ring, open the end gap with your fingers and lift the other side of the ring over the piston crown.

Removing the piston


    Cylinder and piston
    ...

    Checking the cylinder and piston
    1. Check: Piston wall Cylinder wall Vertical scratches Replace the cylinder, and replace the piston and piston rings as a set. 2. Measure: Piston-to-cylinder clearance a. Mea ...

    Other materials:

    Checking the diode
    1. Check: Diode Out of specification Replace. NOTE: The pocket tester or the analog pocket tester readings are shown in the following table. a. Disconnect the diode from the wire harness. b. Connect the pocket tester ( × 1) to the diode terminals as shown. c. Check the diod ...

    Disassembling the rear brake caliper
    1. Remove: Brake caliper piston "1" Brake caliper piston dust seal "2" Brake caliper piston seal "3" a. Blow compressed air into the brake hose joint opening "a" to force out the piston from the brake caliper. WARNING Cover the brake caliper piston with a rag. Be careful no ...

    Rider seat
    To remove the rider seat Insert the key into the seat lock, and then turn it clockwise. Seat lock Open. Pull the rider seat off. To install the rider seat 1. Insert the projection on the front of the rider seat into the seat holder as shown. Projection ...

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