PIAGGIO 500 cc, Service Manual

Page: 92 / 239

Thermal unit and timing system
Injector assembly
- Check that the components are well clean
- Assemble new O rings and lubricate them with grease.
- Apply thread locking compound LOCTITE 242 to the
fixing screw and tighten it to the prescribed torque.
Tightening torque:
Injector support fixing screw: 3 - 4 N·m
05_238
Disassembly of throttle body from manifold
N.B.: The throttle body assembly includes various
components that come supplied all together.
Check the components as described in Chapter 9-
Injection.
- The throttle body is supplied already
Warning
calibrated. Absolutely avoid tampering with the valve
beat register as the register has been suitably sealed.
For any troubles related with the slow running, see
Chapter 9-Injection.
N.B.: The throttle body can be removed with the manifold
disassembled or assembled.
- Remove the 3 fixing screws shown in the figure.
05_241
- Check the condition of the sealing lips on the coupling
surfaces between manifold-throttle body and mani-
fold-head.
Warning
- The penetration of air may compromise
the injection system correct operation, in particular with
engine running at idle speed.
05_242
7 - 30
Note.
After restoring the engine, check again that the CO%
value at idle is within the prescribed range.
Should the CO% exceed the allowable range carry out
the adjustment as described on page 9-95