THE CRANKSHAFT is available in two CATEGO-
RIES:
Characteristic
Crankshaft category:
CAT. 1 - CAT. 2
CRANKSHAFT CATEGORY IDENTIFICATION:
The identification is indicated on the counterweight shoulder «*1 - *2», if carried out with micropinholing.
Otherwise, «1 - 2» if done manually with an electric pen. The spare part identification is located on the
package with a drawing number plus FC1/FC2 or (001/002).
If a crankshaft comprising two half-shafts of different categories needs to be replaced, also replace both
crankcase halves, combining the two components (Shaft and Crankcase) featuring the same category.
Cylinder Head
Before performing head service operations, thoroughly clean all coupling surfaces. Note the position of
the springs and the valves so as not to change the original position during refitting
- Using a trued bar and a feeler gauge check that the cylinder head surface is not worn or distorted.
Characteristic
Maximum allowable run-out:
0.03 mm
- In case of faults, replace the head.
- Check the sealing surfaces for the exhaust manifold.
- Check that the camshaft and the rocking lever pin capacities exhibit no wear.
- Check that the head cover show no signs of wear.
- Check that there is no cooling liquid leakage from the seals.
- Insert the valves into the cylinder head.
- Alternatively check the intake and exhaust
valves.
- The test is carried out by filling the manifold with
petrol and checking that the head does not ooze
through the valves when these are just pressed
with the fingers.
Characteristics Vespa LX - S 125 3V ie 150 3V ie (2012)
CHAR - 20
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