Piston Rings - APRILIA M192M Workshop Manual

Engines M192M / M191M / M245M / M234M / M282M / M281M
3.6.17.

PISTON RINGS

•
Install the three piston rings one by one in the cylinder
area with original diameter. Use the piston to set the
rings at right angles to the cylinder axis.
•
Measure rings opening with a feeler gauge.
•
If the permitted values are exceeded, change the rings.
Engines M192M / M245M /
M281M / M234M / M282M
(125 - 200 cc)
Engine M191M (150 cc)
NOTE Before changing only piston rings, make sure that the rings-piston groove and piston-cylinder clearance values
are observed. Installing new piston rings on a worn cylinder could result in non-standard bedding.
Standard opening
st
1 piston ring
nd
2 piston ring
Scraper ring
st
1 piston ring
nd
2 piston ring
Scraper ring
0.20 ÷ 0.40 mm
0.10 ÷ 0.30 mm
0.15 ÷ 0.35 mm
0.15 ÷ 0.30 mm
0.20 ÷ 0.40 mm
0.20 ÷ 0.40 mm
ENGINE
Max. value
1 mm
1 mm
1 mm
0.40 mm
0.40 mm
0.50 mm
3 - 99