Yamaha FT50C - Page 40

SPEC
Specifications
2-5
62Y5A11
Margin thickness (D)
Intake mm (in) 0.6–1.0 (0.024–0.039)
Exhaust mm (in) 0.7–1.1 (0.028–0.043)
Stem diameter
Intake mm (in) 5.48–5.49 (0.2157–0.2161)
Exhaust mm (in) 5.46–5.47 (0.2150–0.2153)
Guide inside diameter
Intake and exhaust mm (in) 5.50–5.51 (0.2165–0.2169)
Stem-to-guide clearance
Intake mm (in) 0.01–0.03 (0.0004–0.0012)
Exhaust mm (in) 0.03–0.05 (0.0012–0.0020)
Stem runout limit mm (in) 0.03 (0.0012)
Valve springs
Free length mm (in) 39.85 (1.569)
Minimum free length mm (in) 37.85 (1.490)
Tilt limit mm (in) 1.7 (0.07)
Connecting rods
Small-end inside diameter mm (in) 15.985–15.998 (0.6293–0.6298)
Big-end inside diameter mm (in) 36.000–36.024 (1.4173–1.4183)
Crank pin oil clearance mm (in) 0.016–0.040 (0.0006–0.0015)
Crankshaft
Crankshaft journal
Diameter mm (in) 42.984–43.000 (1.6923–1.6929)
Crankshaft pin
Diameter mm (in) 32.984–33.000 (1.2986–1.2992)
Runout limit mm (in) 0.04 (0.0016)
Crankcase
Crankcase main journal inside
diameter
mm (in) 46.000–46.024 (1.8110–1.8120)
Crankshaft main journal oil
clearance
mm (in) 0.012–0.036 (0.0005–0.0014)
Oil pump
Type Trochoid
Outer rotor-to-housing
clearance
mm (in) 0.09–0.15 (0.001–0.006)
Outer rotor-to-inner rotor
clearance limit
mm (in) 0.01–0.10 (0.0004–0.0039)
Rotor-to-cover clearance mm (in) 0.03–0.08 (0.001–0.003)
Thermostats
Opening temperature °C (°F) 60 (140)
Fully open temperature °C (°F) 70 (158)
Valve open lower limit mm (in) 3.0 (0.12)
Item Unit
Model
FT50CEHD FT50CED FT50CET