Yamaha YZF-R25 User manual

EAS20004
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.
• The manual is divided into chapters and each chapter is divided into sections. The current section title
“1” is shown at the top of each page.
• Sub-section titles “2” appear in smaller print than the section title.
• To help identify parts and clarify procedure steps, there are exploded diagrams “3” at the start of each
removal and disassembly section.
• Numbers “4” are given in the order of the jobs in the exploded diagram. A number indicates a disas-
sembly step.
• Symbols “5” indicate parts to be lubricated or replaced.
Refer to “SYMBOLS” on page 1-4.
• A job instruction chart “6” accompanies the exploded diagram, providing the order of jobs, names of
parts, notes in jobs, etc. This step explains removal and disassembly procedure only. For installation
and assembly procedure, reverse the steps.
• Jobs “7” requiring more information (such as special tools and technical data) are described sequen-
tially.

EAS20005
SYMBOLS
The following symbols are used in this manual for easier understanding.
TIP
The following symbols are not relevant to every vehicle.
SYMBOL DEFINITION SYMBOL DEFINITION
Serviceable with engine mounted Gear oil
Filling fluid Molybdenum disulfide oil
Lubricant Brake fluid
Special tool Wheel bearing grease
Tightening torque Lithium-soap-based grease
Wear limit, clearance Molybdenum disulfide grease
Engine speed Silicone grease
Electrical data Apply locking agent (LOCTITE®).
Engine oil Replace the part with a new one.
Silicone fluid
G
M
BF
B
T
R
.
.
LS
M
S
LT
E
New
S

EAS10003 TABLE OF CONTENTS
GENERAL INFORMATION 1
SPECIFICATIONS 2
PERIODIC CHECKS AND
ADJUSTMENTS 3
CHASSIS 4
ENGINE 5
COOLING SYSTEM 6
FUEL SYSTEM 7
ELECTRICAL SYSTEM 8
TROUBLESHOOTING 9

1
GENERAL INFORMATION
IDENTIFICATION ............................................................................................1-1
VEHICLE IDENTIFICATION NUMBER .....................................................1-1
FEATURES......................................................................................................1-2
OUTLINE OF THE FI SYSTEM.................................................................1-2
FI SYSTEM................................................................................................1-3
MULTI-FUNCTION METER UNIT .............................................................1-4
IMPORTANT INFORMATION .........................................................................1-9
PREPARATION FOR REMOVAL AND DISASSEMBLY........................... 1-9
REPLACEMENT PARTS...........................................................................1-9
GASKETS, OIL SEALS AND O-RINGS ....................................................1-9
LOCK WASHERS/PLATES AND COTTER PINS .....................................1-9
BEARINGS AND OIL SEALS ..................................................................1-10
CIRCLIPS ................................................................................................1-10
RUBBER PARTS.....................................................................................1-10
BASIC SERVICE INFORMATION.................................................................1-11
QUICK FASTENERS...............................................................................1-11
ELECTRICAL SYSTEM...........................................................................1-12
SPECIAL TOOLS ..........................................................................................1-17

IDENTIFICATION
1-1
EAS20007
IDENTIFICATION
EAS30002
VEHICLE IDENTIFICATION NUMBER
The vehicle identification number “1” is stamped
into the frame under the passenger seat.
1