Removing The Cylinder Head; Removing The Valves - APRILIA SR MAX 125 ie Service Station Manual

Engine

Removing the cylinder head

- Undo the two screws «1» fixing the head to the
transmission-side crankcase half.
- Unscrew the four nuts «2» by loosening them in
two or three stages and in a crossed sequence.
- Remove the head.
NOTE
IF NEEDED, THE HEAD MAY BE REMOVED WITH THE
CAMSHAFT, ROCKER PINS AND FIXING BRACKET. THE
HEAD CAN ALSO BE REMOVED WITHOUT REMOVING
THE CHAIN AND THE CRANKSHAFT CHAIN TENSIONER.
- Remove the gasket.

Removing the valves

NOTE
CHECK RESIDUAL STROKE IN ORDER TO AVOID RESONANCES IN THE INTAKE VALVES AS
DESCRIBED IN THE PAGE ON «ENGINE/THERMAL GROUP AND TIMING SYSTEM/VALVE
CHECK» EVERY TIME THAT EITHER THE INTAKE VALVES OR THEIR COMPONENTS ARE RE-
MOVED.
- Use the specific tool to remove the cotters, cap and spring.
CAUTION
REPLACE THE VALVES IN SUCH A WAY AS TO RECOGNISE THEIR ORIGINAL POSITION ON
THE HEAD.
Specific tooling
020382Y011 adapter for valve removal tool
020382Y Tool to extract valve cotters
ENG - 128
SR MAX 125 ie