Airsal Alu-Sport 50 cc Ø 40 mm replacement piston ring set for Peugeot vertical AC

Genuine Airsal replacement piston rings for the Airsal Alu-Sport 50cc cylinder kit for Peugeot vertical AC.

Piston rings wear with mileage. If performance drops noticeably on an otherwise healthy engine, worn rings are often the cause. A clear sign is blow-by marks on the piston skirt below the rings (combustion residue caused by poor sealing). A new piston ring set restores full compression, provided the cylinder bore surface and piston are in good condition.

Technical specifications

• Fits: Airsal Alu-Sport 50cc cylinder kit for Peugeot vertical AC (Airsal No. 02021940)
• Series: Alu-Sport
• Displacement: 50 cc
• Ring diameter / bore: Ø 40 mm
• Engine: Peugeot vertical
• Cooling: air-cooled (AC)
• Engine type: 2-stroke
• Cylinder material (kit): Aluminium with a hard-coated cylinder bore surface
• Airsal part number: 11021940

Installation and running-in notes

• On 2-stroke pistons, the ring ends must sit against the locating pins in the ring grooves – otherwise the ring can catch in a port and break.
• Do not overstretch the rings when fitting them; clean carbon deposits from the ring grooves beforehand.
• Lightly oil the rings and cylinder bore surface before assembly.
• If the cylinder bore surface coating is damaged, replacing the rings alone will not help.
• Airsal replacement rings only fit Airsal pistons or cylinders of the specified size.
• Use a new cylinder gasket set during installation.
• After working on the piston and cylinder, run the engine in gently: avoid full load during the first kilometres, vary the engine speed and do not let the engine overheat. Afterwards, check the spark plug colour and carburettor settings.

Matching parts from the same Airsal product family

• Cylinder kit: Airsal Alu-Sport 50cc cylinder kit for Peugeot vertical AC (Airsal no. 01021940)
• Cylinder kit: Airsal Alu-Sport 50cc cylinder kit for Peugeot vertical AC (Airsal No. 02021940)
• Gasket set: Airsal Alu-Sport 50cc gasket set for Peugeot vertical AC (Airsal no. 14021940)
• Piston: Airsal Alu-Sport 50cc piston for Peugeot vertical AC (Airsal part no. 06021940)
• Cylinder head: Airsal Sport 49,2cc 40mm cylinder head for vertical Peugeot AC (Airsal part no. 04021940)

Airsal is a long-established Spanish manufacturer that produces its cylinder kits in its own factory. Airsal supplies individual replacement parts for its kits, such as pistons, piston rings, gasket sets and cylinder heads, so an Airsal cylinder can be rebuilt without replacing the entire kit.