1999 "EE" Evinrude 70HP 4-Stroke Service Manual, P/N 787023, Page 109Get this manual
Valve Guide to Valve Stem Clearance Standard: Intake0.00080.0020 in(0.0200.050 mm) Exhaust0.00180.0030 in(0.0450.075 mm) Limit: Intake: 0.0028 in(0.070 mm) Exhaust: 0.0035 in (0.090 mm) StandardValve Stem Outside Diameter IN EX 0.27420.2748 in(6.9656.980 mm) 0.27320.2738 in(6.9406.955 mm) Valve Guide Inside Diameter 0.27560.2762 in (5.7007.015 mm) 0.27560.2762 in(7.0007.015 mm)
Valve Stem End Length Limit: Intake and Exhaust: 0.0238 in (6.05 mm) Valve Stem Runout Limit: Intake and Exhaust: 0.002 in (0.05 mm) Valve Head Radial Runout Limit: Intake and Exhaust: 0.003 in (0.08 mm) Valve Spring Free Length Standard: 1.94 in(49.3 mm) Limit: 1.89 in(48.1 mm) Valve Spring Tension Standard: 54.764.3 Ibsfor 1.63 in (24.829.2 kg for 41 .5 mm) Limit: 50.2 Ibsfor 1.63 in (22.8 kg for 41.5 mm) Valve Spring Squareness Limit: 0.08 in(2.0 mm) Piston to Cylinder Clearance Standard: 0.00080.0016 in (0.0200.040 mm) Limit: 0.0039 in (0.100 mm) Standard: Cylinder Bore 2.91342.9142 in(74.00074.020 mm)