At DMG Motorsports, we present the Vortex F5 Rear Sprocket 42T-520 Black Hardcoat Aluminum for Yamaha (642AK-42) — a race-proven drivetrain upgrade built for riders who demand serious strength without added weight. Vortex has been manufacturing championship-winning sprockets, and this F5 hardcoat rear sprocket carries that pedigree straight to your bike. CNC machined from premium 7075 aluminum, it delivers the perfect balance of light weight and durability, while the jet black hard anodized finish combined with a PTFE coating keeps the sprocket running cleaner, cooler, and longer under hard use. Whether you're chasing lap times on the track or looking for a durable, good-looking upgrade for the street, this sprocket is engineered to perform.

Features:

• CNC machined from 7075 aluminum for outstanding strength and light weight
• Hard anodized (type 3) with a jet black dye for a durable, race-ready finish
• PTFE coated for added lubricity, cleaner running, and extended durability
• Unique tooth design engineered for improved concentricity, quieter operation, and longer sprocket life
• 520 pitch, 42-tooth configuration designed to fit Yamaha models
• Trusted by champions — proven on the track by professional race teams worldwide
• Precision manufactured to tight tolerances for reliable power transfer