Overhaul piston rings (Ducati ST2)

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The piston rings must not show any signs of forcing or scoring.

Note. Spare pistons are supplied with piston rings and gudgeon pin.

Piston ring-piston groove coupling

The figure shows the axial clearance of the piston rings.

Upper piston ring wear limit: 0.15 mm/0.0059 in.

Second piston ring and scraper ring wear limit: 0.10 mm/0.0039 in.

Note. The punched word TOP must always be facing up in piston-piston ring couplings.

Piston ring-cylinder coupling

Insert the piston ring in the lowest part of the cylinder (where wear is at a minimum), making sure it is positioned "in square".


Measure the distance between the two ring ends:

• 1° and 2° piston ring wear limit: 1.0 mm/0.0039 in.
• scraper ring wear limit: 1.0 mm/0.0039 in.

Note. A higher play indicates excessive wear of the piston ring or cylinder, or a combination of the two.

See this article in russian language

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Article about repair motorcycles «Ducati ST series ST2» (1997-2003): «Overhaul piston rings»: https://motoinstruction.ru/en/Ducati/ST/ST2/engine/repair/112138 <a href="https://motoinstruction.ru/en/Ducati/ST/ST2/engine/repair/112138">Overhaul piston rings</a> - article about repair motorcycles «Ducati ST series ST2» (1997-2003) from section «Engine repair». [url=https://motoinstruction.ru/en/Ducati/ST/ST2/engine/repair/112138]Overhaul piston rings[/url] - article about repair motorcycles «Ducati ST series ST2» (1997-2003) from section «Engine repair».