Inspecting The Cylinder Head - VESPA GT 125 Workshop Manual

Vespa GT 125-200
N.B.
BEFORE FITTING THE CYLINDER, CAREFULLY BLOW OUT THE LUBRICATION DUCT AND OIL
THE CYLINDER BARREL.
Specific tooling
020393Y Piston fitting band
020287Y Clamp to assemble piston on cylinder

Inspecting the cylinder head

- Using a trued bar and feeler gauge check that the
cylinder head surface is not worn or distorted.
Maximum allowable run-out: 0.05 mm
- Check that the camshaft and the rocker pin ca-
pacities exhibit no wear.
- Check that the cylinder head cover surface, the
intake manifold and the exhaust manifold are not
worn.
Characteristic
bearing «A»
Ø 12.000 - 12.018 mm
bearing «B»
Ø 20.000 ÷ 20.021 mm
bearing «C»
Ø 37.000 - 37.025 mm
Engine
ENG - 139