2004 YAMAHA WR 450F Notices Demploi (in French)

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YAMAHA WR 450F 2004  Notices Demploi (in French) 4 - 42
ENG
CYLINDRE ET PISTON
ZYLINDER UND KOLBEN
CILINDRO Y PISTÓN
ZYLINDER UND KOLBEN
ZYLINDER UND KOLBEN
Demontage-Arbeiten:1 Zylinder demontieren2 Kolben demontieren
Demontage-ArbeitenReihen-
fol

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YAMAHA WR 450F 2004  Notices Demploi (in French) 4 - 43
ENGCYLINDER AND PISTON
REMOVAL POINTS
Piston
1. Remove:
Piston pin clips 1 
Piston pin 2 
Piston 3 
NOTE:
Put identification marks on each piston head
for reference during reinstallation.


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YAMAHA WR 450F 2004  Notices Demploi (in French) ENG
4 - 43
CYLINDRE ET PISTON
ZYLINDER UND KOLBEN
CILINDRO Y PISTÓN
AUSBAU
Kolben
1. Demontieren:
Kolbenbolzen-Sicherungs-
ringe 1 
Kolbenbolzen 2 
Kolben 3 
HINWEIS:
Die Kolbenböden für den sp

Page 388 of 754

YAMAHA WR 450F 2004  Notices Demploi (in French) 4 - 44
ENGCYLINDER AND PISTON
Cylinder bore “C”95.00 ~ 95.01 mm
(3.7402 ~ 3.7406 in)
Taper limit “T”0.05 mm (0.002 in)
Out of round “R”0.05 mm (0.002 in)
“C” = Maximum D
“T” = (Max

Page 389 of 754

YAMAHA WR 450F 2004  Notices Demploi (in French) ENG
4 - 44
CYLINDRE ET PISTON
ZYLINDER UND KOLBEN
CILINDRO Y PISTÓN
Zylinderboh-
rung “C”95,00– 
95,01 mm 
(3,7402–
3,7406 in)
Konizität “T”0,05 mm 
(0,002 in)
Unrundheit 
“R”0,05 mm

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YAMAHA WR 450F 2004  Notices Demploi (in French) 4 - 45
ENGCYLINDER AND PISTON
Piston ring
1. Measure:
Ring side clearance
Use a feeler gauge 1. 
Out of specification → Replace the pis-
ton and rings as a set.
NOTE:
Clean carbon from the piston r

Page 391 of 754

YAMAHA WR 450F 2004  Notices Demploi (in French) ENG
4 - 45
CYLINDRE ET PISTON
ZYLINDER UND KOLBEN
CILINDRO Y PISTÓN
Kolbenring
1. Messen:
Ringnutspiel
Fühlerlehre 1 verwenden. 
Unvorschriftsmäßig → Kol-
ben (komplett) mit Kolben-
ringen erne

Page 392 of 754

YAMAHA WR 450F 2004  Notices Demploi (in French) 4 - 46
ENGCYLINDER AND PISTON
Piston pin
1. Inspect:
Piston pin
Blue discoloration/grooves → Replace,
then inspect the lubrication system.
2. Measure:
Piston pin-to-piston clearance
ASSEMBLY AND I