Checking The Valve Springs; Checking The Valves - Yamaha F200C Service Manual

Valve spring compressor 4:
YM-01253
Valve spring compressor attachment
5:
YB-06320

Checking the valve springs

1. Measure the valve spring free length a.
Replace if out of specification.
Valve spring free length a:
44.20 mm (1.740 in)
2. Measure the valve spring tilt b. Replace
if out of specification.
Valve spring tilt limit b:
1.5 mm (0.06 in)

Checking the valves

1. Check the valve face for pitting or wear.
Replace if necessary.
2. Measure the valve margin thickness a.
Replace if out of specification.
69J1D11
Valve margin thickness a:
Intake: 0.7 mm (0.028 in)
Exhaust: 1.0 mm (0.039 in)
3. Measure the valve stem diameter b.
Replace if out of specification.
Valve stem diameter b:
Intake:
5.477–5.492 mm
(0.2156–0.2162 in)
Exhaust:
5.464–5.479 mm
(0.2151–0.2157 in)
4. Measure the valve stem runout. Replace
if out of specification.
Cylinder head
5-34
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