6. CYLINDER HEAD/VALVES PEOPLE 250
Straight Edge
INSPECTION
CYLINDER HEAD
Check the spark plug hole and valve areas for
cracks.
Check the cylinder head for warpage with a
straight edge and feeler gauge.
Service Limit: 0.05mm repair or replace if
over
Feeler Gauge
VALVE SPRING FREE LENGTH
Measure the free length of the inner and outer
valve springs.
Service Limits:
Inner (IN, EX) : 29.5mm replace if below
Outer (IN, EX): 39.5mm replace if below
VALVE /VALVE GUIDE
Inspect each valve for bending, burning,
scratches or abnormal stem wear.
Check valve movement in the guide.
Measure each valve stem O.D.
Service Limits: IN: 4.925mm replace if
below
EX: 4.915mm replace if
below
CYLINDER HEAD ASSEMBLY
Install the valve spring seats and stem seals.
Lubricate each valve stem with engine oil and
insert the valves into the valve guides.
Be sure to install new valve stem seals.
Special
Valve spring compressor E040
Valve Spring Compressor
6-8
4.7 / 5