2002 YAMAHA YZ250LC engine

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Page 70 of 584

YAMAHA YZ250LC 2002  Manuale duso (in Italian) 2-3
MAINTENANCE SPECIFICATIONSSPEC
Item Standard Limit
Cylinder head:
Combustion chamber capacity 21.5 cm
3…
(0.757 Imp oz, 0.727 US oz)
Warp limit…
0.03 mm (0.0012 in)
Cylinder:
Bore size 66.400~

Page 71 of 584

YAMAHA YZ250LC 2002  Manuale duso (in Italian) 2-4
MAINTENANCE SPECIFICATIONSSPEC
Item Standard Limit
Transmission:
Main axle deflection limit…
0.01 mm (0.0004 in)
Drive axle deflection limit…
0.01 mm (0.0004 in)
Shifter:
Shifting type Cam dru

Page 77 of 584

YAMAHA YZ250LC 2002  Manuale duso (in Italian) 2-10
MAINTENANCE SPECIFICATIONSSPEC
M  6 × 1.0
M10 × 1.25
M10 × 1.25
M20 × 1.5
M  8 × 1.25
–
M  6 × 1.0
M  6 × 1.0
M  8 × 1.25
M10 × 1.25
M10 × 1.25
M10 × 1.25
M16 × 1.5
M14 × 1.5
M14

Page 79 of 584

YAMAHA YZ250LC 2002  Manuale duso (in Italian) 2-12
GENERAL TORQUE SPECIFICATIONS/
DEFINITION OF UNITS
SPEC
This chart specifies torque for standard faste-
ners with standard I.S.O. pitch threads. Torque
specifications for special components or as

Page 116 of 584

YAMAHA YZ250LC 2002  Manuale duso (in Italian) 2-13
CABLE ROUTING DIAGRAMSPEC
EC240000
CABLE ROUTING DIAGRAM
1Fuel tank breather hose
2Cable guide
3Throttle cable
4Clamp
5Clutch cable
6Wireharness
7“ENGINE STOP” button lead
8CDI unit
9CDI unit

Page 117 of 584

YAMAHA YZ250LC 2002  Manuale duso (in Italian) 2-13
SCHEMA DE CHEMINEMENT DES CABLES
KABELFÜHRUNGSÜBERSICHTPLAN
DIAGRAMMA DEL PASSAGGIO DEI CAVISPEC
KABELFÜHRUNGSÜBER-
SICHTPLAN
1Kraftstofftank - Belüftungsschlauch
2Kabelführung
3Gasseil
4Kl

Page 118 of 584

YAMAHA YZ250LC 2002  Manuale duso (in Italian) 2-14
CABLE ROUTING DIAGRAMSPEC
1Ground lead 
2Ignition coil lead
3Clamp
4Wireharness
5CDI magneto lead
6YPVS breather hose
7Radiator breather hose
8Cable guide
9“ENGINE STOP” button lead
0Brake ho

Page 119 of 584

YAMAHA YZ250LC 2002  Manuale duso (in Italian) 2-14
SCHEMA DE CHEMINEMENT DES CABLES
KABELFÜHRUNGSÜBERSICHTPLAN
DIAGRAMMA DEL PASSAGGIO DEI CAVISPEC
1Massekabel
2Zündspulekabel
3Klemme
4kalbelbaum
5Leitungskabel des CDI - Magnetzün-
ders
6YPVS