YAMAHA WR 426F 2002 Owners Manual

YAMAHA WR 426F 2002 Owners Manual WR 426F 2002 YAMAHA YAMAHA https://www.carmanualsonline.info/img/51/52438/w960_52438-0.png YAMAHA WR 426F 2002 Owners Manual
Trending: brake, oil dipstick, weight, brake pads replacement, tow, oil capacity, radiator

Page 431 of 776

YAMAHA WR 426F 2002  Owners Manual ENG
 
4 - 44 
CYLINDRE ET PISTON 
ZYLINDER UND KOLBEN 
CILINDRO Y PISTÓN 
Zylinderboh-
rung “C”WR426F:
95,00– 
95,01 mm
WR400F:
92,00–
92,01 mm
Konizität “T”0,05 mm
Unrundheit 
“R”0,

Page 432 of 776

YAMAHA WR 426F 2002  Owners Manual 4 - 45
ENGCYLINDER AND PISTON
3rd step:
Calculate the piston-to-cylinder clearance
with following formula:
Piston-to-cylinder clearance =
Cylinder bore “C” –
Piston skirt diameter “P”
Pisto

Page 433 of 776

YAMAHA WR 426F 2002  Owners Manual ENG
4 - 45
CYLINDRE ET PISTON
ZYLINDER UND KOLBEN
CILINDRO Y PISTÓN
3. Schritt
Kolbenlaufspiel nach der fol-
genden Formel berechnen:
Kolbenlaufspiel = 
Zylinderbohrung “C” – 
Kolbenschaftdurc

Page 434 of 776

YAMAHA WR 426F 2002  Owners Manual 4 - 46
ENGCYLINDER AND PISTON
3. Measure:
Ring end gap 
Out of specification → Replace.
NOTE:
You cannot measure the end gap on the
expander spacer of the oil control ring. If the oil
control ring

Page 435 of 776

YAMAHA WR 426F 2002  Owners Manual ENG
4 - 46
CYLINDRE ET PISTON
ZYLINDER UND KOLBEN
CILINDRO Y PISTÓN
3. Messen:
Stoßspiel
Unvorschriftsmäßig → Kol-
benring erneuern.
HINWEIS:
Das Stoßspiel der Ölabstreifring-Ex-
panderfeder

Page 436 of 776

YAMAHA WR 426F 2002  Owners Manual 4 - 47
ENGCYLINDER AND PISTON
2. Measure:
Piston pin-to-piston clearance
ASSEMBLY AND INSTALLATION
Piston
1. Install:
Piston rings
Onto the piston.
NOTE:
Be sure to install the piston rings so that

Page 437 of 776

YAMAHA WR 426F 2002  Owners Manual ENG
4 - 47
CYLINDRE ET PISTON
ZYLINDER UND KOLBEN
CILINDRO Y PISTÓN
2. Messen:
Kolbenbolzenspiel
ZUSAMMENBAU UND MONTAGE 
Kolben
1. Montieren:
Kolbenringe
(auf den Kolben)
HINWEIS:
Die Kolbenringe

Page 438 of 776

YAMAHA WR 426F 2002  Owners Manual 4 - 48
ENG
2. Position:
Top ring
2nd ring
Oil ring
Offset the piston ring end gaps as
shown.
aTop ring end
b2nd ring end
cOil ring end (upper)
dOil ring
eOil ring end (lower)
45°
135°135°
a
b ce

Page 439 of 776

YAMAHA WR 426F 2002  Owners Manual ENG
4 - 48
2. Montieren:
1. Kompressionsring (Topring)
2. Kompressionsring
Ölabstreifring
Ringstöße laut Abbildung ver-
setzen.
aRingstoß (1. Kompressionsring)
bRingstoß (2. Kompressionsring)

Page 440 of 776

YAMAHA WR 426F 2002  Owners Manual ENG
4 - 49
CLUTCH (WR426F)
CLUTCH (WR426F)
CLUTCH
Extent of removal:1 Push rod and push lever removal2 Push pod 1 disassembly
3 Friction plate and clutch plate removal4 Clutch housing removal
Extent o
Trending: wiring, change time, sensor, fuel pressure, seat adjustment, brake sensor, oil capacity