PIAGGIO XEVO 125 Euro 3 Service Station Manual page 142

Engine
- Check the radial clearance on the connecting rod.
-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.
N.B.
WHEN MEASURING THE WIDTH OF THE
CRANKSHAFT, MAKE SURE THAT THE MEAS-
UREMENTS ARE NOT MODIFIED BY THE RAD-
IUSES OF FITTINGS WITH THE CRANKSHAFT
BEARINGS.
Characteristic
Standard clearance:
0.036 ÷ 0.054 mm
Standard dimensions:
55.75 ÷ 55.90 mm
The crankshaft can be reused when the width is
within the standard values and the surfaces show
no signs of scoring.
N.B.
IN CASE OF NEW UTILISATION, MAINTAIN
THE FIRST FITTING 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.
Check the diameters of both bearings of the crank-
shaft according to the axes and surfaces shown in
the figure. The half-shafts are classified in two cat-
egories Cat. 1 and Cat. 2 as shown the chart
below.
Specification
Standard diameter - Category 1
Standard diameter - Category 2
ENG - 50
STANDARD DIAMETER
XEVO 125 Euro 3
Desc./Quantity
28.994 ÷ 29.000
29.004 ÷ 29.010