2002–2018 Yamaha YZ85 Top End Rebuild Kit – Forged Piston

SKU 255288961025

🛠️ YZ85 Top End Rebuild Kit | Fits All 2002–2018 Yamaha YZ85 Models

Complete Performance Top End Kit – Reliable, Ready, Race-Proven!

Upgrade your YZ85 with this all-in-one stock bore top end rebuild kit—designed for riders who demand performance and durability. Includes everything needed for a high-quality rebuild with top-tier components like Wiseco or Wossner forged pistons, Maxlock studs, and high-temp piston rings.

📦 What’s Included:

• Aftermarket stock bore cylinder

• Wiseco or Wossner forged piston kit**

• Nitrite-coated hi-temp piston rings

• Chrome wristpin

• Circlips

• Wristpin bearing

• Top end gasket kit

• Maxlock head stud kit (with nuts)

• Cylinder-to-case Maxlock allen drive studs

• Cylinder-to-case dowel pins

• NGK spark plug

Note: Piston brand may vary based on current availability. All parts are new in sealed original packaging.

💡 Key Features:

✅ Complete Bolt-On Kit
All parts needed for a top end rebuild—no guessing, no missing pieces.

✅ Race-Grade Components
Forged pistons, precision hardware, and coated rings built for performance and longevity.

✅ Maxlock Stud System
Engineered for extreme conditions—high clamp force and lifetime reliability.

✅ Trusted by Riders Worldwide
This is the go-to rebuild kit for reliable restoration and race-day confidence.

🔧 Installation Note:
This is not a DIY job for beginners. We strongly recommend installation by a qualified, experienced mechanic. Engine building requires precise measurements, tools, and technique. Improper installation voids all warranties.

📦 Returns & Warranty Policy:
Please inspect your order upon delivery and contact us first with any issues—most can be resolved without a full return. Returns are accepted within 30 days only if the kit is 100% complete, unused, and in original packaging.

STUD WARRANTY: If a stud fails during use, we will send a full replacement stud kit—no labor or additional parts included. Failed studs must be returned for inspection.

Warranty does not cover issues related to improper installation, tuning, or break-in. Any warranty claim requires parts to be returned for inspection—no exceptions.