Yamaha YFM250XL(C) Service Manual page 29

Item
Camshaft runout limit
Cam chain:
Cam chain type / No. of links
Cam chain adjustment method
Rocker arm / rocker arm shaft:
Rocker arm inside diameter
Shaft outside diameter
Arm-to-shaft clearance
Valve, valve seat, valve guide:
Valve clearance (cold)
Valve dimensions:
"A" "A"
Head Dia
"A" head diameter
"B" face width
"C" seat width
"D" margin thickness
Stem outside diameter
MAINTENANCE SPECIFICATIONS
"C" 6.572 ~ 6.692 mm
(0.259 ~ 0.263 in)
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DID25SH/104
Automatic
12.000 ~ 12.018 mm
(0.4724 ~ 0.4731 in)
11.981 ~ 11.991 mm
(0.4717 ~ 0.4721 in)
0.009 ~ 0.037 mm
(0.0004 ~ 0.0015 in)
IN 0.05 ~ 0.09 mm
(0.002 ~ 0.004 in)
EX 0.11 ~ 0.15 mm
(0.004 ~ 0.006 in)
EX.
"B"
Face Width Seat Width
IN 33.9 ~ 34.1 mm
(1.335 ~ 1.343 in)
EX 28.4 ~ 28.6 mm
(1.118 ~ 1.126 in)
IN 1.7 ~ 2.8 mm (0.067 ~ 0.110 in)
EX 1.7 ~ 2.8 mm (0.067 ~ 0.110 in)
IN 0.9 ~ 1.1 mm (0.035 ~ 0.043 in)
EX 0.9 ~ 1.1 mm (0.035 ~ 0.043 in)
IN 0.8 ~ 1.2 mm (0.032 ~ 0.047 in)
EX 0.8 ~ 1.2 mm (0.032 ~ 0.047 in)
IN 5.975 ~ 5.990 mm
(0.2352 ~ 0.2358 in)
EX 5.960 ~ 5.975 mm
(0.2346 ~ 0.2352 in)
2 - 5
SPEC
Standard
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0.03 mm
(0.0012 in)
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"C"
Margin Thickness
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1.6 mm
(0.063 in)
1.6 mm
(0.063 in)
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Limit
2
"D"
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