The genuine Piaggio cylinder kit with part number 876457 is designed for liquid-cooled 300cc Quasar engines. It consists of a cylinder with a 75.0 mm bore, together with the corresponding piston, piston rings, piston pin and piston pin retaining clips. The assembly serves as a standard replacement for worn or damaged cylinder and piston components.
The cylinder features a black-coated cast body with a precision-machined cylinder bore. The machined mating surfaces, mounting holes and coolant passages are matched to the design of the corresponding Piaggio engine. The supplied piston features the ring grooves required for four-stroke operation and a suitably shaped piston crown.
QUASAR refers to an engine family developed by Piaggio for higher-performance scooters. The designation stands for Quarter-liter Smooth Augmented Range. The 300cc Quasar engine is a liquid-cooled, single-cylinder four-stroke engine with electronic fuel injection, four valves and an overhead camshaft.
The standard bore measures 75.0 mm with a piston stroke of 63.0 mm. This results in an actual displacement of approximately 278cc. The designation 300cc therefore refers to the commonly used engine displacement class. LC stands for Liquid Cooled and identifies the liquid cooling system, in which coolant removes heat from the cylinder and cylinder head areas.
This engine design was used in the Vespa GTS 300, GTS Super 300 and GTV 300, among others, as well as in various models from Piaggio, Aprilia, Derbi and Gilera.
The cylinder is made of grey cast iron and features a machined internal bore. Grey cast iron provides a wear-resistant running surface with suitable properties for contact between the piston rings and cylinder wall. The outside of the cylinder body has a black coating, while the functional and sealing surfaces are machined to a metallic finish.
The piston is connected to the connecting rod by a piston pin. The piston rings perform different functions: the compression rings seal the combustion chamber against the crankcase, while the oil control ring regulates the amount of oil on the cylinder wall.
Replacing the cylinder and piston together allows damaged or worn components to be renewed without changing the standard bore or original engine displacement. Correct piston clearance, the appropriate dimensional classification and professional installation are essential for reliable operation.
The cylinder head is not included in the scope of delivery. The gaskets required for installation must be considered separately according to the respective engine version and the actual contents supplied.
Different development stages and component versions exist within the Piaggio 300cc engine family. In particular, the later HPE engines must be considered separately when identifying replacement parts. Compatibility should therefore be checked before ordering using the vehicle identification number, engine type and vehicle-specific Piaggio spare parts catalogue.
Before installation, the sealing surfaces, coolant passages and adjacent engine components must be inspected for damage or contamination. The piston rings must be installed according to the manufacturer's specifications, with their ring gaps correctly positioned. The installation direction of the piston and secure fitting of the piston pin retaining clips must also be observed.
The specified cylinder base and cylinder head gaskets must be used during assembly, together with the vehicle-specific tightening torques. After reassembly, the cooling system must be properly filled and bled.
The genuine Piaggio cylinder kit 876457 allows the listed Quasar engines to be repaired while retaining the standard cylinder bore and original displacement class. It is therefore suitable for repairs where the original engine design and technical dimensions are to be maintained.
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