VESPA GT 200, Руководство по ремонту

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10.4 Removing the Rocker Cover
- Remove the five rocker cover screws and the
pipe shown in the figure, after removing the
relative strip; remove the tappet cover with
decanter and automatic valve.
- Remove the sealing gasket.
-
Check that the unidirectional valve is in good
working order.
10.5 Refitting the Rocker Cover
Perform the operations for removal in the reverse
order and tighten the five screws at the proper
torque.
Note: Install a new O-ring gasket on the tappet
cover.
Tightening torque:
Rocker cover screws 8.1-9.6 lbs·ft
( 11-13 N·m )
10.6 Checking the Compression
-
Remove the spark plug cap with cold engine.
- Remove the ignition spark plug.
- Fit a compression test gauge into the spark plug seat using a 10mm spark plug joint and
tighten to the prescribed torque.
-
Let the engine run by the starter and with the carburetor in fully open position as long as
the gauge value is steady. If pressure is higher than 9 bar, remove the tool and proceed
in the reverse order of removal.
If the pressure is below the indicated values, check the engine test speed; if the engine
speed is less than 450 rpm, check the starting system; if the value is within the prescribed
limits or slightly higher, check the timing. If no faults are detected:
- Ensure that the cylinder base gasket was properly selected.
- Check the sealing on the cylinder-piston assembly (piston rings-valves).
Tightening torque:
Spark plug 8.8-10.3 lbs · ft ( 12-14 N·m )