Combustion Chamber Cleaning - Segway VILLIAN SSV Series Service Manual

CYLINDER HEAD, CYLINDER, PISTON CYLINDER HEAD, CYLINDER, PISTON
Combustion chamber
TIPS
If necessary, the valve can be re-dressed or ground. If
it is severely worn, burned, bent or damaged, it must be
replaced
◆ Use a micrometer to measure the diameter of the
valve stem at three places, and then turn it 90° to
measure again (a total of six measurements), and
compare with the standard value.
Valve stem diameter:
Standard
5.455 ~ 5.470 mm
exhaust
(0.2147" ~ 0.2153")
5.475 ~ 5.490 mm
intake
(0.2155" ~ 0.2161")
◆ Measure the diameter of the top and bottom of the
valve guide hole, and measure two directions at
each position.
Valve guide aperture:
5.500 - 5.515 mm(0.2165" ~ 0.2171")
◆ Measure each valve and valve guide combination
separately.
TIPS
The valve guide cannot be replaced.

Combustion chamber cleaning

WARNING
!
Wear protective goggles when cleaning the combustion
chamber.
◆ Clean all carbon deposits in the combustion
chamber and valve seat area.
◆ Visually inspect the surface of the cylinder head
gasket and the combustion chamber for cracks or
damage. Pay close attention to the spark plug and
seat ring area.
CAUTION CAUTION
!
Do not use metal scrapers, thick wire brushes or
abrasive cleaners to clean the cylinder head. May cause
damage.
3-5-30
Limit
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