Big Bore Cylinder Unit Ø 53 mm 105 cc YAMAHA YZ 85 cc 2002-2018

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 cylinder kit developed by Athena guarantees better performance than the original spare part, extreme reliability and optimal smoothness thanks to the lightweight aluminum cylinder, the barrel with nickel-silicon coating, and a piston designed to further reduce friction.

The kit includes the high-quality aluminum cylinder with standard bore, the cylinder head , the complete piston 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.