Segway VILLIAN SSV Series Service Manual page 130

Intake
B B
C C
Exhaust
E E
A A
CYLINDER HEAD, CYLINDER, PISTON CYLINDER HEAD, CYLINDER, PISTON
D D
A A
B B
C C
【A】 30°
【B】 45°
【C】 60°
【D】 1.0 ~ 1.1mm (0.0394" ~ 0.0433")
limit: 1.4mm (0.055")
【A】 30°
【B】 45°
【C】 60°
【E】 1.5 ~ 1.6mm (0.0591" ~ 0.0630")
limit: 1.9mm (0.075")
◆ Wash all the fi llings in the area with hot soapy water,
and then blow it off with compressed air.
◆ Lubricate the valve guide with clean engine oil, and
apply an oil-based or water-based abrasive on the
valve disc surface.
TIPS
If the interference angle repair method is used, no
grinding is required.
◆ Use a grinding tool or a section of fuel line
connected to the valve stem to insert the valve into
the respective guide rail and grind it.
◆ Rotate the valve back and forth quickly until the
cutting sound is smooth. Lift the valve slightly away
from the seat, rotate it 1/4 turn, and repeat the
grinding process. Do this 4 to 5 times until the valve
is completely seated and the surface of the valve
seat is smooth, and then repeat this process for
other valves.
◆ Thoroughly clean the cylinder head and valve.
CAUTION CAUTION
!
Don't grind too much. Excessive grinding will cause the
valve to sink into the cylinder head, thereby reducing
the valve clearance. If the valve is sunk too deep, the
clearance cannot be adjusted and the cylinder head
must be replaced.
3-5-33