Cylinder Works 02-18 Yamaha YZ 85 85cc +5mm Big Bore Cylinder Kit 107.8cc 8.2:1 Comp. 52.5mm

Cylinder Works is a well-known name in performance engine components, and this Big Bore Cylinder Kit for your Yamaha YZ 85 is a prime example of their focus on power and displacement. If you're looking to get more out of your 85cc machine, this kit is designed to do just that. It takes your engine from its stock 85cc up to a substantial 107.8cc, giving you a noticeable bump in horsepower and overall engine performance.

What makes this kit stand out is that it comes as a complete package, hand-matched by Cylinder Works. You get a big bore Vertex piston, which is known for its solid construction, along with a full top-end gasket kit that includes all the necessary o-rings. This all-in-one approach not only simplifies the rebuild process but also offers cost savings compared to sourcing each OEM component separately. The cylinder itself is constructed from a high-quality 2618 aluminum alloy, chosen for its strength and durability, which is crucial for handling the increased demands of a bigger displacement engine. The compression ratio comes in at 8.2:1, a well-balanced figure for this application.

This kit is designed to give your Yamaha YZ 85 an improved performance profile. When you're rebuilding the top end, having a matched set like this ensures everything works together seamlessly. It's a solid option for riders looking to enhance their bike's power output and engine capacity.