2016 YAMAHA YZ250F clock

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Page 45 of 356

YAMAHA YZ250F 2016  Owners Manual ENGINE SPECIFICATIONS
2-4
Valve spring
Free length (intake) 36.69 mm (1.44 in)
Limit 34.85 mm (1.37 in)
Free length (exhaust) 34.86 mm (1.37 in)
Limit 33.11 mm (1.30 in)
Installed length (intake) 31.4

Page 100 of 356

YAMAHA YZ250F 2016  Owners Manual ENGINE
3-16
7. Pour the specified amount of engine oil into 
the oil filler cap hole.
8. Install:
• Oil filler cap
9. Check:
• Oil level
Refer to “CHECKING THE ENGINE OIL 
LEVEL” on page 3-14.

Page 102 of 356

YAMAHA YZ250F 2016  Owners Manual ENGINE
3-18
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a. Turn the crankshaft counterclockwise with a 
wrench.
b. Align the top dead center (TDC)

Page 120 of 356

YAMAHA YZ250F 2016  Owners Manual ELECTRICAL SYSTEM
3-36
EAS1SM9112
ELECTRICAL SYSTEM
EAS1SM9113CHECKING THE SPARK PLUG
1. Remove:
• Seat
• Air scoop (left/right)
Refer to “GENERAL CHASSIS” on page 4-
1.
• Fuel tank “1”

Page 206 of 356

YAMAHA YZ250F 2016  Owners Manual CAMSHAFT
5-13
EAS1SM9206REMOVING THE CAMSHAFT
1. Remove:
• Timing mark accessing screw “1”
• Crankshaft end accessing screw “2”
2. Align:
• Alignment mark
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Page 208 of 356

YAMAHA YZ250F 2016  Owners Manual CAMSHAFT
5-15
c. Install the dowel pins and the camshaft 
caps.
TIP
• Tighten the camshaft cap bolts in a crisscross 
pattern from innermost to outer caps.
• Do not turn the camshaft when measurin

Page 209 of 356

YAMAHA YZ250F 2016  Owners Manual CAMSHAFT
5-16
EAS1SM9210CHECKING THE DECOMPRESSION SYS-
TEM
1. Check:
• Decompression system
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a. Check

Page 210 of 356

YAMAHA YZ250F 2016  Owners Manual CAMSHAFT
5-17
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2. Install:
• Timing chain tensioner
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