PIAGGIO 500 cc, Service Manual

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Warning
Driving shaft crankcase
- If the driving shaft made up of two half
shafts of different classes is to be replaced, it is also
necessary to replace the two half crankcases and to
match the two components (shaft and crankcase) with
the same class.
- Check the driving shaft gear according to the proce-
dure described in Chapter 7-Thermal Unit and Timing
System.
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Engine half crankcase check
- Before checking the crankcases, carefully clean all
the surfaces and lubrication ducts.
- For the half crankcase transmission side, act on the
main bearing brass, cooling jet transmission side (see
figure) and lubrication duct.
N.B.: The jet is fed through the main bearing brass.
Correct operation of this component improves the pis-
ton crown cooling. Its clogging will cause troubles that
are difficult to notice (piston temperature increase).
Failure of this component may drastically reduce the
lubrication pressure to the main bearing brass and
connecting rod.
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