Yamaha YW125Y_ Utility Trailer User Manual


 
2-5
SPEC
Item
Standard
Limit
B
C
D
A
Head Diameter Face Width Seat Width Margin Thickness
ENGINE SPECIFICATIONS
Timing chain
Model/number of links Morse 92RH2005/94
Tensioning system Automatic
Valve, valve seats, valve guides
Valve clearance (cold)
Intake 0.10 ~ 0.14mm
(0.004 ~ 0.006in)
Exhaust 0.16 ~ 0.20mm
(0.006 ~ 0.008in)
Valve dimensions
Valve head diameter A
Intake 18.9 ~ 19.1mm
(0.744 ~ 0.752in)
Exhaust 16.9 ~ 17.1mm
(0.665 ~ 0.673in)
Valve face width B
Intake 1.48 ~ 2.18mm
(0.058 ~ 0.086in)
Exhaust 1.91 ~ 2.61mm
(0.075 ~ 0.103in)
Valve seat width C
Intake 0.9 ~ 1.1mm (0.035 ~ 0.043in)
Exhaust 0.9 ~ 1.1mm (0.035 ~ 0.043in)
Valve margin thickness D
Intake 0.7mm (0.028in)
Exhaust 1.0mm (0.039in)
Valve stem diameter
Intake 4.970 ~ 4.985mm 4.940mm
(0.1956 ~ 0.1963in) (0.1945in)
Exhaust 4.955 ~ 4.970mm 4.925mm
(0.1951 ~ 0.1957in) (0.1939in)
Valve guide inside diameter
Intake 5.000 ~ 5.012mm 5.050mm
(0.1969 ~ 0.1973in) (0.1988in)
Exhaust 5.000 ~ 5.012mm 5.050mm
(0.1969 ~ 0.1973in) (0.1988in)
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