Yamaha XT660R Service Manual

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.
1
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”.
2
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.
3
Sub-section titles appear in smaller print than the section title.
4
To help identify parts and clarify procedure steps, there are exploded diagrams at the start of
each removal and disassembly section.
5
Numbers are given in the order of the jobs in the exploded diagram. A circled number indicates a
disassembly step.
6
Symbols indicate parts to be lubricated or replaced.
Refer to “SYMBOLS”.
7
A job instruction chart accompanies the exploded diagram, providing the order of jobs, names of
parts, notes in jobs, etc.
8
Jobs requiring more information (such as special tools and technical data) are described sequen-
tially.

Yamaha XT660R Specifications

General

Displacement	660cc
Bore x Stroke	100.0 mm x 84.0 mm
Compression Ratio	10.0:1
Fuel System	Electronic Fuel Injection
Ignition System	TCI
Starter System	Electric
Transmission	5-speed
Final Drive	Chain
Rear Suspension	Swingarm
Front Tire	90/90-21
Rear Tire	130/80-17
Length	2, 240 mm
Width	865 mm
Height	1, 230 mm
Seat Height	865 mm
Wet Weight	181 kg
Fuel Capacity	15 liters
Lubrication System	Dry sump
Engine Type	Liquid-cooled, 4-stroke, SOHC, 4-valve
Front Suspension	Telescopic fork
Front Brake	Single disc, 298 mm
Rear Brake	Single disc, 245 mm
Maximum Power	35 kW (48 PS) @ 6, 000 rpm
Maximum Torque	58 Nm @ 5, 250 rpm