APRILIA SL 750 SHIVER, Service Station Manual, Page: 192 / 303

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.
•
Measure the pin outside diameter (a)
and if not complying with specifica-
tions, replace the pin.
Pin outside diameter: 22.00 - 21.97 mm (0.8661
- 0.8650 in) Limit: 21.96 mm (0.8646 in)
•
Measure the pin housing diameter (b)
and replace the piston if not complying
with specifications.
Pin housing diameter (b): 22.010 - 22.015 mm
(0.8665 - 0.8667 in)
•
Calculate the clearance between pin
and pin hole and, if not complying with
specifications, replace both pin and
piston.
Pin - piston clearance: C = b - a
0.010 - 0.045 mm (0.0004 - 0.0018 in)
Limit: 0.060 mm (0.0024 in)
C
YLINDER
-
PISTON COUPLING
Specification Desc./Quantity
Piston - cylinder coupling Type A Cylinder: 91.990 - 91.977 mm (3.6216 - 3.6219 in)
Engine
SL 750 SHIVER
ENG - 44