VESPA GT 200 Workshop Manual page 151

Vespa GT 125-200
Fitting clearance
Connecting rod axial clearance
Check the radial clearance on the connecting rod.
Standard clearance: 0.036 ÷ 0.054 mm
-Check the surfaces that limit the axial free-play
are not scored and measure the width of the crank-
shaft between these surfaces, as shown in the
diagram.
Standard dimensions:
55.75 ÷ 55.90 mm (125 cc)
51.40 ÷ 51.45 mm (200 cc)
N.B.
WHEN MEASURING THE WIDTH OF THE CRANKSHAFT,
MAKE SURE THAT THE MEASUREMENTS ARE NOT
MODIFIED BY THE RADIUSES OF FITTINGS WITH THE
CRANKSHAFT BEARINGS.
The crankshaft can be reused when the width is
within the standard values and the surfaces show
no signs of scoring.
Shim washers (only 200 cc)
- Check the thickness of the shim washers.
Standard thickness: 2.175 ÷ 2.225 mm
- Check that the shim washers are not stripped.
N.B.
IN CASE OF NEW UTILISATION, MAINTAIN THE FIRST FIT-
TING POSITION.
If the axial clearance between crankshaft and crankcase exceeds the standard and the crankshaft does
not have any defect, the problem must be due to either excessive wear or wrong machining on the
engine crankcase.
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