Yamaha EH63 Service Manual page 149

MAINTENANCE SPECIFICATIONS
Valve:
Valve dimensions
Valve head diameter (Intake)
Valve head diameter
(Exhaust)
Valve stem diameter (Intake)
Valve stem diameter (Exhaust)
Limit (Intake)
Limit (Exhaust)
Valve stem length (Intake)
Valve stem length (Exhaust)
Valve face contact width
(Intake)
Valve face contact width
(Exhaust)
Limit (Intake)
Limit (Exhaust)
Valve seat contact width
(Intake)
Valve seat contact width
(Exhaust)
Limit (Intake)
Limit (Exhaust)
Valve stem runout limit
Valve guide:
Valve guide inside diameter
(Intake)
Valve guide inside diameter
(Exhaust)
Stem to guide clearance (Intake)
Stem to guide clearance
(Exhaust)
Valve clearance (cold) (Intake)
Valve clearance (cold) (Exhaust)
Valve spring:
Valve spring free length (Intake)
Valve spring free length
(Exhaust)
Limit (Intake)
Limit (Exhaust)
Fuel pump:
Pump type
34.99–35.01 mm (1.3775–1.3783 in)
30.9–31.1 mm (1.2165–1.2244 in)
5.970–5.985 mm (0.2350–0.2356 in)
5.970–5.985 mm (0.2350–0.2356 in)
5.940 mm (0.2338 in)
5.940 mm (0.2338 in)
79.8 mm (3.1417 in)
80.3 mm (3.1614 in)
0.7–1.0 mm (0.0275–0.0393 in)
0.7–1.0 mm (0.0275–0.0393 in)
2.0 mm (0.0787 in)
2.0 mm (0.0787 in)
0.7–1.0 mm (0.0275–0.0393 in)
0.7–1.0 mm (0.0275–0.0393 in)
2.0 mm (0.0787 in)
2.0 mm (0.0787 in)
0.01 mm (0.0004 in)
6.035–6.053 mm (0.2375–0.2383 in)
6.035–6.053 mm (0.2375–0.2383 in)
0.050–0.083 mm (0.0019–0.0032 in)
0.050–0.083 mm (0.0019–0.0032 in)
0.07–0.13 mm (0.0027–0.0051 in)
0.07–0.13 mm (0.0027–0.0051 in)
36.5 mm (1.4370 in)
36.5 mm (1.4370 in)
34.67 mm (1.3649 in)
34.67 mm (1.3649 in)
Diaphragm type
7-5
1
2
3
4
5
6
7
8
9
10