Inspecting The Valves - APRILIA SPORTCITY ONE 125 Service Station Manual

SPORTCITY ONE 125
Characteristic
Standard drainage guide diameter
5.012 mm
Standard inlet guide diameter
5.012 mm
- If the width of the impression on the valve seat or
the diameter of the valve guide exceed the speci-
fied limits, replace the cylinder head.
- Check width of the impression on the valve seat
«V»
Characteristic
Wear limits:
Max. 1.6 mm.

Inspecting the valves

- Measure the diameter of the valve stems in the
three positions indicated in the diagram.
- Calculate the clearance between valve and valve
guide.
Characteristic
Minimum diameter admitted - Inlet:
4.96 mm
Minimum diameter admitted - Outlet:
4.95 mm
Standard clearance - Inlet:
0.013 ÷ 0.040 mm
Standard clearance - Outlet:
0.025 ÷ 0.052 mm
Maximum clearance admitted- Inlet:
0.062 mm
Maximum clearance admitted - Outlet:
0.072 mm
Engine
ENG - 95