Yamaha MTN850-A 2017 Service Manual page 40

Radiator cap valve opening pressure
Water pump
Water pump type
Impeller shaft tilt limit
Spark plug(s)
Manufacturer/model
Spark plug gap
Cylinder head
Warpage limit
Camshaft
Camshaft cap inside diameter
Camshaft journal diameter
Camshaft-journal-to-camshaft-cap clearance
Limit
Camshaft lobe dimensions
Lobe height (Intake)
Limit
Lobe height (Exhaust)
Limit
Camshaft runout limit
Valve, valve seat, valve guide
Valve clearance (cold)
Intake
Exhaust
Valve dimensions
Valve seat contact width (intake)
Limit
Valve seat contact width (exhaust)
Limit
Valve stem diameter (intake)
Limit
Valve stem diameter (exhaust)
Limit
Valve guide inside diameter (intake)
Valve guide inside diameter (exhaust)
Valve-stem-to-valve-guide clearance (in-
take)
Limit
Valve-stem-to-valve-guide clearance (ex-
haust)
Limit
Valve stem runout
Valve spring
Free length (intake)
Limit
Free length (exhaust)
Limit
Spring tilt (intake)
Spring tilt (exhaust)
ENGINE SPECIFICATIONS
93.3–122.7 kPa (0.93–1.23 kgf/cm², 13.5–17.8
psi)
Single suction centrifugal pump
0.15 mm (0.006 in)
NGK/CPR9EA9
0.8–0.9 mm (0.031–0.035 in)
0.10 mm (0.0039 in)
24.500–24.521 mm (0.9646–0.9654 in)
24.459–24.472 mm (0.9630–0.9635 in)
0.028–0.062 mm (0.0011–0.0024 in)
0.080 mm (0.0032 in)
36.290–36.390 mm (1.4287–1.4327 in)
36.190 mm (1.4248 in)
35.720–35.820 mm (1.4063–1.4102 in)
35.620 mm (1.4024 in)
0.030 mm (0.0012 in)
0.11–0.20 mm (0.0043–0.0079 in)
0.26–0.30 mm (0.0102–0.0118 in)
0.90–1.10 mm (0.0354–0.0433 in)
1.60 mm (0.06 in)
1.10–1.30 mm (0.0433–0.0512 in)
1.80 mm (0.07 in)
4.475–4.490 mm (0.1762–0.1768 in)
4.445 mm (0.1750 in)
4.460–4.475 mm (0.1756–0.1762 in)
4.430 mm (0.1744 in)
4.500–4.512 mm (0.1772–0.1776 in)
4.500–4.512 mm (0.1772–0.1776 in)
0.010–0.037 mm (0.0004–0.0015 in)
0.080 mm (0.0032 in)
0.025–0.052 mm (0.0010–0.0020 in)
0.100 mm (0.0039 in)
0.010 mm (0.0004 in)
39.31 mm (1.55 in)
37.34 mm (1.47 in)
37.78 mm (1.49 in)
35.89 mm (1.41 in)
1.7 mm (0.07 in)
1.6 mm (0.06 in)
2-3