APRILIA SL 750 SHIVER Specifications download pdf (Page 191)

Checking the piston

•

Measure the piston skirt diameter "P"

with a micrometer (a=10 mm (0.39 in)

from the piston lower border).

•

Calculate the clearance between pis-

ton and cylinder as follows:

Piston - cylinder clearance C = C - P

Piston - cylinder clearance: 0.050 - 0.064 mm

(0.00197 - 0.00252 in) Limit: 0.100 mm (0.00039

in)

•

Replace the cylinder, the piston and

the piston ring all together if not com-

plying with specifications.

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 CLEAR-

ANCE IS EXCESSIVE, REPLACE THE THREE

PISTON RINGS.

SL 750 SHIVER Engine

ENG - 43

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APRILIA SL 750 SHIVER Specifications Page 191

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