Yamaha XQ150 Service Manual download pdf (Page 4)

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.

햲 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".

햳 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.

햴 Sub-section titles appear in smaller print than the section title.

햵 To help identify parts and clarify procedure steps, there are exploded diagrams at the start of each

removal and disassembly section.

햶 Numbers are given in the order of the jobs in the exploded diagram. A circled number indicates

a disassembly step.

햷 Symbols indicate parts to be lubricated or replaced. Refer to "SYMBOLS".

햸 A job instruction chart accompanies the exploded diagram, providing the order of jobs, names of

parts, notes in jobs, etc.

햹 Jobs requiring more information (such as special tools and technical data) are described

sequentially.

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 Timing chain guide (exhaust side)

3 Cylinder

4 Dowel pin

5 Cylinder gasket

6 Piston pin clip

7 Piston pin

8 Piston

9 Piston ring (top)

10 Piston ring (2nd)

11 Oil ring

For installation, reverse the removal

procedure.

EAS00253

REMOVING THE CYLINDER AND PISTON

1. Remove:

• piston pin clip 햲

• piston pin 햳

• piston 햴

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

햲

햳

햴

FWD

12 Nm (1.2 m•kg)

햲

햹

햳햴햵

햶

햷

햸

1 2 3 4 5 6 7 8 9 ... 39 40

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Yamaha XQ150 Service Manual Page 4

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