Description
Product Overview
The MOFANS Cylinder Piston Gasket Kit is engineered for Yamaha YZ80 (1993‑2001) and YZ85 (2002‑2018) two‑stroke engines. Constructed from high‑strength cast‑iron, the kit delivers superior wear resistance and heat dissipation. It includes a precision‑machined cylinder, piston, piston rings, wristpin, needle bearing, circlips, base gasket and O‑rings, all matched to the original OEM specifications for a seamless fit.
Usage
Designed for both professional workshop rebuilds and dedicated enthusiasts, this kit restores engine compression and reduces oil leakage in off‑road, motocross and trail riding conditions. Install the components during a standard engine overhaul; no modifications are required, making it suitable for riders who demand reliable performance on demanding tracks.

Why Choose Us
MOFANS combines decades of experience in powersports parts with rigorous quality control. Each component undergoes dimensional testing to ensure exact tolerances, guaranteeing a tight seal and consistent compression ratios. The cast‑iron material resists deformation under high RPM stress, extending service intervals and minimizing maintenance costs.
Key Features
- Premium cast‑iron construction for durability and heat resistance
- Complete OEM‑matched set eliminates the need for additional parts
- Direct replacement design requires no engine modifications
- Precise density gasket provides a reliable seal with minimal torque
- Ideal for professional rebuilds and high‑performance riding applications
FAQ
Is this kit compatible with all Yamaha YZ80 and YZ85 model years?
Yes, the kit fits Yamaha YZ80 models from 1993 to 2001 and YZ85 models from 2002 to 2018, matching the original factory specifications.
Do I need any special tools to install the kit?
Standard engine rebuilding tools are sufficient. However, professional installation is recommended to ensure proper torque settings and alignment.
Can I use this kit for a high‑performance aftermarket build?
The cast‑iron components are designed for durability and can handle increased power output, making them suitable for performance upgrades when paired with appropriate tuning.
What warranty does MOFANS provide?
MOFANS offers a one‑year limited warranty covering manufacturing defects. Contact customer support with your purchase details for assistance.
How does the gasket material improve engine performance?
The high‑density cast‑iron gasket maintains a consistent seal under high temperature and pressure, reducing compression loss and improving overall engine efficiency.





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