Yamaha F50A - Page 49

62Y3A11
2-6
1
2
3
4
5
6
7
8
I
2nd ring
Dimension B mm (in) 1.47–1.49 (0.058–0.059)
Dimension T mm (in) 2.49–2.51 (0.098–0.099)
End gap mm (in) 0.30–0.50 (0.012–0.020)
Side clearance mm (in) 0.03–0.07 (0.001–0.003)
Oil ring
Dimension B mm (in) 2.34–2.46 (0.092–0.097)
Dimension T mm (in) 2.75 (0.108)
End gap mm (in) 0.20–0.70 (0.008–0.028)
Side clearance mm (in) 0.05–0.19 (0.002–0.008)
Camshafts
Intake (A) mm (in) 30.89–30.99 (1.2161–1.2200)
Exhaust (A) mm (in) 30.82–30.92 (1.2135–1.2175)
Intake and
exhaust (B)
mm (in) 25.95–26.05 (1.0217–1.0256)
Camshaft journal diameter
#1 mm (in) 36.93–36.94 (1.4539–1.4543)
#2, #3, #4 mm (in) 36.94–36.95 (1.4543–1.4547)
Camshaft journal oil clearance
#1 mm (in) 0.055–0.100 (0.0022–0.0039)
#2, #3, #4 mm (in) 0.045–0.090 (0.0018–0.0035)
Maximum camshaft runout mm (in) 0.04 (0.0016)
Rocker arm shafts
Outside diameter mm (in) 15.98–15.99 (0.6291–0.6295)
Rocker arms
Inside diameter mm (in) 16.00–16.01 (0.6299–0.6303)
Valves
Valve clearance (cold)
Intake mm (in) 0.20
±
0.05 (0.008
±
0.002)
Exhaust mm (in) 0.30
±
0.05 (0.012
±
0.002)
Head diameter (A)
Intake mm (in) 29.9–30.1 (1.177–1.185)
Exhaust mm (in) 25.9–26.1 (1.020–1.027)
Face width (B)
Intake mm (in) 1.84–2.97 (0.072–0.117)
Exhaust mm (in) 1.98–3.11 (0.078–0.122)
Seat contact width (C)
Intake mm (in) 0.9–1.1 (0.035–0.043)
Exhaust mm (in) 0.9–1.1 (0.035–0.043)
Item Unit
Model
USA ———F50TR
Canada — F50TH — F50TR
Worldwide F50AEHD F50AEHT F50AED F50AET
Maintenance specifications