2007 YAMAHA WR 250F maintenance

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Page 4 of 912

YAMAHA WR 250F 2007  Owners Manual EC020000
INTRODUCTION
Congratulations on your purchase of
a Yamaha WR series. This model is
the culmination of Yamaha’s vast
experience in the production of pace-
setting racing machines. It repre-

Page 10 of 912

YAMAHA WR 250F 2007  Owners Manual EC050000
TO THE NEW OWNER
This manual will provide you with a
good basic understanding of fea-
tures, operation, and basic mainte-
nance and inspection items of this
machine. Please read this manual
c

Page 20 of 912

YAMAHA WR 250F 2007  Owners Manual E0A0000
CONTENTS
CHAPTER 1
GENERAL 
INFORMATION
DESCRIPTION...........................  1-1
MACHINE IDENTIFICATION.....  1-3
IMPORTANT INFORMATION....  1-5
CHECKING OF 
CONNECTION.....................

Page 76 of 912

YAMAHA WR 250F 2007  Owners Manual 1 - 51
GEN
INFO
STARTING AND 
BREAK-IN
WARNING
Never start or run the engine in a
closed area. The exhaust fumes
are poisonous; they can cause
loss of consciousness and death
in a very short time. Alw

Page 84 of 912

YAMAHA WR 250F 2007  Owners Manual 1 - 59
GEN
INFO
TORQUE-CHECK POINTS
Frame construction Frame to rear frame
Combined seat and fuel tank Fuel tank to frame
Exhaust system Silencer to rear frame
Engine mounting Frame to engine
Engine b

Page 97 of 912

YAMAHA WR 250F 2007  Owners Manual MAINTENANCE SPECIFICATIONS
2 - 4
SPEC
MAINTENANCE SPECIFICATIONS
ENGINE
Item Standard Limit
Cylinder head:
Warp limit ---- 0.05 mm 
(0.002 in)
Cylinder:
Bore size 77.00 ~ 77.01 mm 
(3.0315 ~ 3.0319 in

Page 98 of 912

YAMAHA WR 250F 2007  Owners Manual MAINTENANCE SPECIFICATIONS
2 - 5
SPEC
Timing chain:
Timing chain type/No. of links 92RH2010-114M/114 ----
Timing chain adjustment method Automatic ----
Valve, valve seat, valve guide:
Valve clearance

Page 99 of 912

YAMAHA WR 250F 2007  Owners Manual MAINTENANCE SPECIFICATIONS
2 - 6
SPEC
Stem runout limit ---- 0.01 mm 
(0.0004 in)
Valve seat width IN 0.9 ~ 1.1 mm 
(0.0354 ~ 0.0433 in)1.6 mm 
(0.0630 in)
EX 0.9 ~ 1.1 mm 
(0.0354 ~ 0.0433 in)1.6 mm
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