Airsal Alu-Sport replacement piston ring set 70 cc for Kymco horizontal AC

Genuine Airsal replacement piston rings for the Airsal Alu-Sport 70cc cylinder kit for Kymco AC (e.g. Dink / Top Boy), without cylinder head.

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 70cc cylinder kit for Kymco AC (e.g. Dink / Top Boy), without cylinder head (Airsal no. 021606476)
• Series: Alu-Sport
• Displacement: 70 cc
• Engine: Kymco horizontal
• Cooling: air-cooled (AC)
• Engine type: 2-stroke
• Cylinder material (kit): Aluminium with a hard-coated cylinder bore surface
• Airsal part number: 111606476

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 70cc cylinder kit for Kymco AC (e.g. Dink / Top Boy), without cylinder head (Airsal no. 021606476)
• Gasket set: Airsal Alu-Sport 70cc gasket set for Kymco AC (e.g. Dink / Top Boy) (Airsal no. 141606476)
• Piston: Airsal Alu-Sport 70cc piston for Kymco AC (e.g. Dink / Top Boy) (Airsal part no. 061606476)

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.

Also fits:

• Kymco: Fever ZX II 50, Maxxer 50, Maxxer 50 (road-legal), MXU 50
• SYM (Sanyang): Jungle 50 (from year 2000), Super Fancy 50