ATHENA R4856-118 Race Gasket Kit for Yamaha 125 YZ 2005–2018

Breathe new life into your race engine with Athena's Race Gasket Kit. Designed for racers and engine builders, this premium gasket kit provides the flexibility to precisely adjust cylinder height for optimized squish clearance, compression ratio, and valve timing. Manufactured with advanced sealing materials and backed by over 40 years of Athena engineering, these gaskets deliver exceptional durability, heat resistance, and leak-free performance under the extreme demands of motocross and enduro competition.

• Race-spec gasket kit designed for precision engine tuning and performance builds
• Includes multiple cylinder base gasket thicknesses for accurate squish and compression adjustment
• Premium gasket materials resist heat, oil, fuel, and extreme cylinder pressures
• Precision-manufactured to meet or exceed OEM sealing specifications
• Advanced sealing treatments help prevent leaks in critical engine areas
• No additional silicone sealants required for proper installation

Includes:

• Cylinder Head Gasket
• OEM Thickness Cylinder Base Gasket
• 0.10mm Thinner Cylinder Base Gasket
• 
  

• Designed for high-performance 2-stroke motocross engines
• Allows adjustment of squish clearance, compression ratio, and valve timing
• Manufactured using premium gasket materials, including Athena's proprietary Motorgasket® technology where applicable
• Engineered for maximum sealing under extreme mechanical and thermal loads

The ATHENA R4856-118 Race Gasket Kit is designed for Yamaha 125 YZ models from 2005 through 2018. This kit is identified as a race gasket kit and provides a model-specific gasket solution for the stated Yamaha application.

Manufactured under the ATHENA brand, the R4856-118 part number makes product identification straightforward when ordering, servicing, or replacing the gasket kit. Its listed unit of measure is each.

This product is supplied as a gasket kit for the specified Yamaha 125 YZ model range. Confirm the model year and application before purchase to ensure the kit matches the intended motorcycle.

Features:

• Brand: ATHENA
• Part Number: R4856-118
• Product Type: Race gasket kit
• Application: Yamaha 125 YZ models from 2005 through 2018
• Unit of Measure: Each