Yamaha YZF-R1 1998, Service Manual

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ENGINE SPECIFICATIONS
SPEC
2 - 5
Timing chain
Model/number of links RH2015 / 130 ----
Tensioning system Automatic ----
Valves, valve seats, valve guides
Valve clearance (cold)
Intake 0.11 ~ 0.20 mm ----
Exhaust 0.21 ~ 0.30 mm ----
Valve dimensions
Valve head diameter A
Intake 22.9 ~ 23.1 mm ----
Exhaust 24.4 ~ 24.6 mm ----
Valve face width B
Intake 1.76 ~ 2.90 mm ----
Exhaust 1.76 ~ 2.90 mm ----
Valve seat width C
Intake 0.9 ~ 1.1 mm ----
Exhaust 0.9 ~ 1.1 mm ----
Valve margin thickness D
Intake 0.5 ~ 0.9 mm ----
Exhaust 0.5 ~ 0.9 mm ----
Valve stem diameter
Intake 3.975 ~ 3.900 mm 3.945 mm
Exhaust 4.460 ~ 4.475 mm 4.43 mm
Valve guide inside diameter
Intake 4.000 ~ 4.012 mm 4.05 mm
Exhaust 4.500 ~ 4.512 mm 4.55 mm
Valve-stem-to-valve-guide clear-
ance
Intake 0.010 ~ 0.037 mm 0.08 mm
Exhaust 0.025 ~ 0.052 mm 0.1 mm
Valve stem runout ---- 0.01 mm
Valve seat width
Intake 0.9 ~ 1.1 mm ----
Exhaust 0.9 ~ 1.1 mm ----
Item Standard Limit
Head Diameter
B
Face Width
C
Seat Width
D
Margin Thickness
A