VESPA 150, Service Station Manual

Page: 20 / 249

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
Clean all the coupling surfaces thoroughly before servicing the head. Pay attention to the position of
the springs and valves so as not to change the original position upon refitting them
- Using a trued bar and a thickness gauge, check that the cylinder head surface is not worn or distorted.
Characteristic
Maximum run-out allowed:
0.03 mm
- In case of irregularities, replace the head.
- Check the sealing surfaces for the exhaust manifold.
- Check that the camshaft and the rocker pin bearings show no signs of wear.
- Check that the head cover show no signs of wear.
- Check that there is no cooling liquid leakage from the seals.
- Fit the valves into the cylinder head.
- Alternatively test the intake and exhaust valves.
- The test should be carried out by filling the mani-
fold with fuel and checking that the head does not
ooze through the valves when they are just press-
ed by the fingers.
Characteristics
Vespa Primavera125 - 150 i.e. 3Valvole (2013)
CHAR - 20