Piston - APRILIA M192M Workshop Manual

ENGINE
3.6.16.

PISTON

•
Thoroughly clean piston ring locations.
•
Use suitable probes to measure the clearance between
piston rings and grooves.
•
If the clearance exceeds the permitted values change
the piston.
NOTE For the 200 cc engine, measure the clearance by in-
serting the feeler gauge from the 2
st
Engines M192M / 1
nd
M245M / M281M /
2
M191M (125 - 150
Scraper ring
cc)
st
1
Engines M234M /
nd
2
M282M (200 cc)
Scraper ring
3 - 98
Engines M192M / M191M / M245M / M234M / M282M / M281M
nd
piston ring side.
Standard coupling clearance
piston ring 0.025 ÷ 0.07 mm
piston ring 0.015 ÷ 0.06 mm
0.015 ÷ 0.06 mm
piston ring 0.015 ÷ 0.06 mm
piston ring 0.015 ÷ 0.06 mm
0.015 ÷ 0.06 mm
Max. allowed clearance after use
0.08 mm
0.07 mm
0.07 mm
0.07 mm
0.07 mm
0.07 mm