APRILIA DORSODURO FACTORY ABS 2011 Service Station Manual page 226

Manuals by Motomatrix / www.motomatrix.co.uk / The Solution For Lost Motorcycle Coded Keys.
Engine
PISTON RINGS
•
Clean off any carbon deposits from the
grooves in the piston rings and from the
rings themselves.
•
Measure the piston ring side clearance
and replace the piston and the piston
rings all together if not complying with
specifications.
Piston ring side clearance:
Top ring (1st slot): 0.030 - 0.065 mm (0.0012 -
0.0026 in)
Intermediate ring (2nd slot): 0.020 - 0.055 mm
(0.0008 - 0.0022 in)
Oil scraper ring (3rd slot): 0.010 - 0.045 mm
(0.0004 - 0.0018 in)
•
Fit the piston ring to the cylinder.
•
Level the installed piston ring with the
piston crown.
•
Measure piston ring port and replace it
if not complying with specifications.
CAUTION
IT IS NOT POSSIBLE TO MEASURE THE GAP OF THE OIL
SCRAPER RING END: IF CLEARANCE IS EXCESSIVE, RE-
PLACE THE THREE PISTON RINGS.
Piston ring end gap:
Top ring: 0.25 - 0.40 mm (0.0079 - 0.0157 in)
Intermediate ring: 0.35 - 0.55 mm (0.0138 -
0.0216 in)
Oil scraper ring: 0.20 - 0.70 mm (0.0079 - 0.0276
in)
PIN
•
Clean off combustion residues from the piston crown and from the area above the top ring.
•
Check for cracks on the piston and for compression on the piston sliding surface (seizing);
Replace the piston if required.
CAUTION
SMALL STRIATIONS ON THE PISTON LINER ARE ADMISSIBLE.
ENG - 226
email: info@motomatrix.co.uk
DORSODURO FACTORY ABS