Big Bore Cylinder Unit With Cylinder Head Ø 58 mm 144 cc YAMAHA YZ 125 cc 1997-2004

The cylinders are the aftermarket engine spare parts in which Athena has been investing for over ten years constantly to improve production and yield. The company's engine cylinders and cylinder kits are recognized worldwide for their performance, durability and reliability. Engineered entirely in Italy by the Athena R&D department, with internal know-how and cutting-edge tools to design and test each cylinder, they are coated with motor-nicksil, a silicon nickel coating developed by Athena to obtain smoothness and optimal wear resistance.

The Big Bore increased thermal unit developed by Athena guarantees an increase in performance that can be found along the curve power, always maintaining reliability equal to that of the original components.

The kit includes the high quality aluminum cylinder with increased bore, cylinder head, piston complete with piston pin and rings and the necessary gaskets.
All components of the thermal unit have been designed, created and tested with severe tests on the track and on the static and dynamic bench to guarantee maximum resistance to high pressures and temperatures.

This cylinder kit can be installed without making any modifications to the motorcycle crankcases.