Fitting clearance
Connecting rod axial clearance 0.20 - 0.50
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.
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.
Characteristic
Standard diameter - Category 2
29.004 ÷ 29.010
Engine Runner 125 - 200
ENG - 174
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