Wiseco 40266M08800 88.00mm Piston 2015–2025 Beta 390 RR 4T

Wiseco 40266M08800 88.00mm Piston 2015–2025 Beta 390 RR 4T

The Wiseco piston kit is precision-engineered to restore and enhance performance in Beta 390 RR four-stroke engines. Built as an 88.00mm Beta 390 RR piston kit with a 12.5:1 compression ratio, this kit delivers reliable power output, smooth throttle response, and consistent engine performance. Manufactured to extremely tight tolerances, the 88.00mm Beta 390 RR piston kit ensures accurate fitment and dependable sealing for both routine maintenance and performance-focused rebuilds.

Constructed from high-quality materials for strength and thermal stability, this 88.00mm Beta 390 RR piston kit is designed to withstand the demands of trail riding, dual-sport use, and endurance riding. Precision machining reduces internal friction and wear, helping extend engine life while maintaining efficient combustion. Riders and mechanics rely on the 88.00mm Beta 390 RR piston kit for its durability, consistent compression, and proven reliability in varied riding conditions.

Key Features

• Precision-machined piston built to tight tolerances for strength and reliability
• 12.5:1 compression ratio for balanced power and efficient performance
• Designed for consistent sealing and long service life
• High-quality materials for improved thermal stability
• Ideal for maintenance rebuilds and performance restoration
• Includes piston rings, wrist pin, and circlips

Vehicle Fitment

• 2017–2020 Beta 390 RR
• 2023–2024 Beta 390 RR
• 2015–2016 Beta 390 RR 4T
• 2021 Beta 390 RR 4T
• 2025 Beta 390 RR 4T

Frequently Asked Questions

Is this piston designed for a stock bore?
Yes, this piston is designed for a standard 88.00mm bore when the cylinder meets Beta factory specifications.

Does the kit include all required components?
Yes, the kit includes piston rings, wrist pin, and circlips for a complete installation.

What type of riding is this piston best suited for?
This piston kit is ideal for trail riding, dual-sport use, and routine engine rebuilds where reliability is critical.

Restore your engine with a precision-built piston kit that delivers consistent performance, dependable durability, and confidence on every ride.

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