APRILIA Atlantic 300 Service Station Manual page 135

ATLANTIC 300 i.e.
Engine
- Insert the retention plate and tighten the two
screws shown in the picture to the prescribed tor-
que.
- Refit the spacer on the camshaft.
- Rotate the engine so that the piston is at top dead
centre, using the reference marks on the flywheel
and the crankcase.
- In this position, fit the chain onto the camshaft
control pulley.
- Insert the pulley on the camshaft while keeping
the reference 4V matching the reference mark on
the head.
- Fit the counterweight and tighten the fixing screw
to the prescribed torque..
- Fit the end-stop ring on the automatic valve-lifter
assembly and fit the automatic valve-lifter cam to
the camshaft.
- Fit the automatic valve-lifter return spring.
During this operation the spring must be loaded
approximately 180°.
- Fit the automatic valve-lifter retaining dish, using
the counterweight fixing screw as reference.
- Tighten the central fixing screw to the prescribed
torque.
- Set the tensioner slider to its home position.
- Fit the chain tensioner on the cylinder using a
new gasket, and tighten the 2 screws to the pre-
scribed torque.
- Insert the chain tensioning spring, together with
the central screw and washer, and tighten the cap
to the prescribed torque.
- Adjust valve clearance
- Fit the spark plug.
Electrode gap: 0.8 mm
NOTE
GREASE THE END-STOP RING TO PREVENT IT COMING
OUT AND FALLING INTO THE ENGINE.
ENG - 135