Genuine Piaggio lower piston ring for liquid-cooled 300cc and 310cc HPE four-stroke engines equipped with pistons manufactured by Asso S.p.A. The oil control ring is installed in the lowest piston ring groove and regulates the amount of oil on the cylinder wall. It removes excess engine oil while maintaining a sufficient lubricating film between the piston and cylinder.
The lower piston ring is an important component of the engine's oil control system. Its function differs from that of the upper compression ring and the middle piston ring. While these primarily contribute to sealing combustion gases, the lower oil control ring is responsible for precisely regulating the lubricating oil film.
The piston ring shown has a dark surface and an open, circular design. A continuous spring structure is visible on the inside, particularly around the ring end gap.
This spring-assisted construction is designed to maintain a defined contact force between the oil control ring and the cylinder wall. This allows excess oil to be scraped from the cylinder surface while controlling the remaining lubricating film.
Proper operation of the oil control ring is essential for keeping oil consumption within the intended limits. Worn or damaged rings may allow more engine oil to enter the combustion chamber, where it is burned. Possible symptoms include increased oil consumption, deposits in the combustion chamber and excessive exhaust smoke.
Piaggio uses pistons from different suppliers within the HPE engine family. In addition to pistons manufactured by Asso S.p.A., versions produced by Fujian Huawei Juquan Precision Technology are also used.
The oil control ring described here is intended for the corresponding piston version manufactured by Asso S.p.A. Piston rings designed for different piston manufacturers must not be combined or interchanged without checking their compatibility.
The vehicle or engine model alone is not sufficient to identify the correct component. Before ordering, the manufacturer of the piston actually installed in the engine must be determined. The markings on the piston should be compared with the information provided in the Piaggio spare parts catalogue.
HPE stands for High Performance Engine and refers to an advanced generation of Piaggio four-stroke engines. The 310 HPE is a liquid-cooled, single-cylinder engine featuring four valves and electronic fuel injection.
Compared with the 300 HPE, the main development is the increased piston stroke. While retaining the 75.0mm cylinder bore, Piaggio increased the stroke from 63.0mm to 70.1mm. This raises engine displacement from 278cc to approximately 310cc. The new engine generation complies with the Euro 5+ emissions standard.
With its longer piston stroke and revised engine design, the 310 HPE differs technically from the previous 300 HPE. However, the specific piston version installed remains the decisive factor when selecting the correct lower piston ring.
The listed vehicle applications are only compatible when the engine is equipped with the corresponding Asso piston version. If a piston manufactured by Fujian Huawei Juquan Precision Technology is installed, the appropriate oil control ring must be identified using the relevant spare parts documentation.
Before installation, carefully inspect the cylinder wall, the lowest piston ring groove and the remaining piston rings for wear or damage. Particular attention should be paid to the piston ring end gap inside the cylinder and the axial clearance of the ring in its groove. The permissible values must be taken from the Piaggio workshop manual.
The oil control ring must not be excessively expanded or twisted during installation. The spring structure must be correctly positioned and must not be damaged. If installation markings are present, they must be aligned according to the manufacturer's specifications.
When installing the remaining piston rings, the specified installation directions and ring end gap positions must also be observed. A damaged piston ring groove or worn cylinder wall cannot be repaired simply by fitting a new oil control ring.
The genuine Piaggio oil control ring 1A013667 is an important replacement component when rebuilding the corresponding Asso pistons used in 300cc and 310cc HPE engines. Selecting the correct ring according to the piston manufacturer and carefully checking the installation clearances are essential for reliable oil control and a properly assembled engine.
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