Big bore 53mm 106cc cylinder kit from Athena for 2019 and newer YZ85.
Very nice looking cylinder kit with 2 piece head, power-valve exhaust, and flat top single ring piston.
Comes with cylinder, head, piston, ring, wrist pin/clips, exhaust valve, gasket set, and a big bag of assorted hardware for installation.
From Athena:
Athena presents the new Big Bore Cylinder Kit developed for Yamaha YZ 85 2019/2023.
The kit was entirely engineered by Athena R&D technicians to ensure not only an increase in displacement, but also a balanced power management, an extreme reliability and a technical improvement compared to the original cylinder kit.
This kit contains a cylinder with modular head, which is refined in materials and structure, a forged piston to ensure maximum performance and resistance, and a gasket kit with three base gaskets in order to choose the most suitable
thickness to fine-tune the squish.
All kit components have been developed to resist the highest temperature, pressure and stress, and they are perfectly replaceable to the OE ones. The cylinder kit was also tested on the track and on the dynamic and static bench to guarantee its performance and certify its quality even under extreme conditions.
Athena cylinder kit can be installed without any other OE components replacement.