VESPA ET4 50 Workshop Manual page 97

ET4 50
- Bring the screw closer but without reaching its
final locking point.
- Push the tensioner pad lightly so as to check the correct timing.
- Use the specific tool to lock the camshaft crown gear and tighten the screw.
- Adjust valve clearance.
- Replace the O-Ring on the tappet cover.
- Fit the tappet cover and lock it with the 4 fixing screws indicated in the figure.
Specific tooling
020565Y Flywheel lock calliper spanner
Locking torques (N*m)
Camshaft pulley screw 12 ÷ 14 Head cover screw 8 ÷ 10 Nm
- Set the tensioner cursor in the rest position.
- Fit the chain tensioner on the cylinder, using a new gasket, and tight the two screws to the prescribed
torque.
- Insert the spring with the central screw and tighten it to the prescribed torque.
- Fit the spark plug.
Characteristic
Recommended spark plug
NGK CR 9EB - CHAMPION RG 4HC
Electric characteristic
Electrode gap
0.7 ÷ 0.8 mm
Locking torques (N*m)
Timing chain tensioner screw 8 ÷ 10 Nm Timing chain tensioner central screw 5 - 6 Ignition spark
plug 10 ÷ 15 Nm
Engine
ENG - 97