ENGINE SPECIFICATIONS
2-3
Exhaust
0.17–0.24 mm (0.0067–0.0094 in)
Valve dimensions
Valve seat contact width limit (intake)
1.6 mm (0.06 in)
Valve seat contact width limit (exhaust)
1.6 mm (0.06 in)
Valve stem diameter limit (intake)
4.945 mm (0.1947 in)
Valve stem diameter limit (exhaust)
4.430 mm (0.1744 in)
Valve guide inside diameter (intake)
5.000–5.012 mm (0.1969–0.1973 in)
Valve guide inside diameter (exhaust)
4.500–4.512 mm (0.1772–0.1776 in)
Valve-stem-to-valve-guide clearance limit
(intake)
0.080 mm (0.0032 in)
Valve-stem-to-valve-guide clearance limit
(exhaust)
0.100 mm (0.0039 in)
Valve stem runout
0.020 mm (0.0008 in)
Valve spring
Free length limit (intake)
34.94 mm (1.38 in)
Free length limit (exhaust)
33.82 mm (1.33 in)
Cylinder
Bore
77.000–77.010 mm (3.0315–3.0319 in)
Wear limit
77.060 mm (3.0339 in)
Piston
Piston-to-cylinder clearance
0.030–0.055 mm (0.0012–0.0022 in)
Diameter
76.955–76.970 mm (3.0297–3.0303 in)
Measuring point (from piston skirt bottom)
4.0 mm (0.16 in)
Piston pin bore inside diameter limit
16.043 mm (0.6316 in)
Piston pin outside diameter limit
15.971 mm (0.6288 in)
Piston-pin-to-piston-pin-bore clearance
0.002–0.022 mm (0.0001–0.0009 in)
Piston ring
Top ring
End gap limit
0.50 mm (0.0197 in)
Ring side clearance
0.030–0.065 mm (0.0012–0.0026 in)
Side clearance limit
0.115 mm (0.0045 in)
Crankshaft
Crank assembly width
55.93–56.00 mm (2.202–2.205 in)
Runout limit
0.030 mm (0.0012 in)
Clutch
Clutch type
Wet, multiple-disc
Clutch lever free play
7.0–12.0 mm (0.28–0.47 in)
Friction plate 1 thickness
2.70–2.90 mm (0.106–0.114 in)
Wear limit
2.60 mm (0.102 in)
Plate quantity
2 pcs
Friction plate 2 thickness
2.72–2.88 mm (0.107–0.113 in)
Wear limit
2.60 mm (0.102 in)
Plate quantity
6 pcs
Clutch plate thickness
1.50–1.70 mm (0.059–0.067 in)
Plate quantity
7 pcs
Warpage limit
0.10 mm (0.004 in)
Clutch spring free length
44.00 mm (1.73 in)
Clutch spring free length limit
41.80 mm (1.65 in)
Push rod bending limit
0.30 mm (0.012 in)
Содержание YZ250FX 2021
Страница 6: ...EAM20162 YAMAHA MOTOR CORPORATION U S A YZ MOTORCYCLE LIMITED WARRANTY ...
Страница 10: ......
Страница 61: ...TIGHTENING TORQUES 2 16 ...
Страница 62: ...CABLE ROUTING DIAGRAM 2 17 EAM20152 CABLE ROUTING DIAGRAM Frame and engine left side view ...
Страница 64: ...CABLE ROUTING DIAGRAM 2 19 Frame and engine right side view ...
Страница 66: ...CABLE ROUTING DIAGRAM 2 21 Handlebar front view ...
Страница 68: ...CABLE ROUTING DIAGRAM 2 23 Frame and engine top view ...
Страница 70: ...CABLE ROUTING DIAGRAM 2 25 Frame and battery top view ...
Страница 72: ...CABLE ROUTING DIAGRAM 2 27 Rear brake right side view ...
Страница 74: ...CABLE ROUTING DIAGRAM 2 29 ...
Страница 112: ...ELECTRICAL SYSTEM 3 36 ...
Страница 153: ...HANDLEBAR 4 39 Throttle grip free play 3 0 6 0 mm 0 12 0 24 in ...
Страница 166: ...FRONT FORK 4 52 1 ...
Страница 184: ...CHAIN DRIVE 4 70 ...
Страница 189: ...LUBRICATION SYSTEM CHART AND DIAGRAMS 5 3 1 Oil filter element 2 Oil pump ...
Страница 190: ...LUBRICATION SYSTEM CHART AND DIAGRAMS 5 4 1 Intake camshaft 2 Exhaust camshaft ...
Страница 191: ...LUBRICATION SYSTEM CHART AND DIAGRAMS 5 5 1 Camshaft 2 Oil pressure check bolt 3 Oil pump 4 Oil filter element ...
Страница 245: ...SHIFT SHAFT 5 59 TIP Align the punch mark a on the shift shaft with the punch mark b in the shift pedal 1 1 2 2 a b ...
Страница 251: ...OIL PUMP 5 65 A Primary drive gear side B Crankcase cover side 5 7 mm 0 02 0 28 in 5 c d 6 8 b 8 6 7 E ...
Страница 264: ...TRANSMISSION 5 78 ...
Страница 274: ...WATER PUMP 6 9 ...
Страница 284: ...THROTTLE BODY 7 9 ...
Страница 287: ......
Страница 288: ...IGNITION SYSTEM 8 1 EAM20142 IGNITION SYSTEM EAM30277 CIRCUIT DIAGRAM ...
Страница 292: ...ELECTRIC STARTING SYSTEM 8 5 EAM20143 ELECTRIC STARTING SYSTEM EAM30279 CIRCUIT DIAGRAM ...
Страница 296: ...CHARGING SYSTEM 8 9 EAM20144 CHARGING SYSTEM EAM30282 CIRCUIT DIAGRAM ...
Страница 299: ...CHARGING SYSTEM 8 12 ...
Страница 300: ...SIGNALING SYSTEM 8 13 EAM20154 SIGNALING SYSTEM EAM30348 CIRCUIT DIAGRAM ...
Страница 304: ...FUEL INJECTION SYSTEM 8 17 EAM20145 FUEL INJECTION SYSTEM EAM30284 CIRCUIT DIAGRAM ...
Страница 329: ...FUEL INJECTION SYSTEM 8 42 ...
Страница 330: ...FUEL PUMP SYSTEM 8 43 EAM20146 FUEL PUMP SYSTEM EAM30287 CIRCUIT DIAGRAM ...
Страница 362: ...SELF DIAGNOSTIC FUNCTION AND DIAGNOSTIC CODE TABLE 9 15 ...
Страница 372: ...CHASSIS 10 9 ...
Страница 374: ......
Страница 376: ......
Страница 377: ...YZ250FXM 2021 WIRING DIAGRAM BAJ 2819U 11_WD indd 1 2020 06 29 15 46 05 ...
Страница 378: ...YZ250FXM 2021 WIRING DIAGRAM BAJ 2819U 11_WD indd 2 2020 06 29 15 46 06 ...