Yamaha XQ125, Руководство по обслуживанию

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EAS00007
HOW TO USE THIS MANUAL
This manual is intended as a handy, easy-to-read reference book for the mechanic. Comprehensive
explanations of all installation, removal, disassembly, assembly, repair and check procedures are
laid out with the individual steps in sequential order.
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The manual is divided into chapters. An abbreviation and symbol in the upper right corner of each
page indicate the current chapter. Refer to "SYMBOLS".
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Each chapter is divided into sections. The current section title is shown at the top of each page,
except in Chapter 3 ("PERIODIC CHECKS AND ADJUSTMENTS"), where the sub-section title(s)
appears.
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Sub-section titles appear in smaller print than the section title.
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To help identify parts and clarify procedure steps, there are exploded diagrams at the start of each
removal and disassembly section.
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Numbers are given in the order of the jobs in the exploded diagram. A circled number indicates
a disassembly step.
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Symbols indicate parts to be lubricated or replaced. Refer to "SYMBOLS".
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A job instruction chart accompanies the exploded diagram, providing the order of jobs, names of
parts, notes in jobs, etc.
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Jobs requiring more information (such as special tools and technical data) are described
sequentially.
ENG ENG
EASM0025
CYLINDER AND PISTON
Removing the cylinder and piston Remove the parts in the order listed.
Cylinder head Refer to “CYLINDER HEAD” section.
1 Cylinder bolt 2
2 Timing chain guide (exhaust side) 1
3 Cylinder 1
4 Dowel pin 2
5 Cylinder gasket 1
6 Piston pin clip 2
7 Piston pin 1
8 Piston 1
9 Piston ring (top) 1
10 Piston ring (2nd) 1
11 Oil ring 1
For installation, reverse the removal
procedure.
EAS00253
REMOVING THE CYLINDER AND PISTON
1. Remove:
• piston pin clip
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• piston pin
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• piston
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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’s groove and the piston’s pin
bore area. If both areas are deburred and the
piston pin is still difficult to remove, remove it
with the piston pin puller.
Piston pin puller
90890-01304
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.
EAS00255
CHECKING THE CYLINDER AND PISTON
1. Check:
• piston wall
• cylinder wall
Vertical scratches
→
Rebore or replace the
cylinder, and replace the piston and piston
rings as a set.
4 - 23 4 - 24
CYLINDER AND PISTON CYLINDER AND PISTON
Order Job/Part Q’ty Remarks
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햳
햴
FWD
1
2
3
4
5
6
7
8
9
10
11
T.R
12 Nm (1.2 m•kg)
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햳 햴 햵
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햷
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