PISTON KIT VERTEX 66.4 B YAMAHA YZ/WR 250 99-22 RACE, VERTEX 22591B SINGLE RING
Vertex UK Piston Kit 22591B. All Vertex Pistons Feature: Standard pistons and components are OEM replacements. Kits include piston, rings, wrist pin and circlips. All pistons are heat treated with a T-5 or T-6 hardening and tempering cycle. Replacement rings are sold individually. Made in Italy. Fitted in many OEM bikes as STD. Specification: Bore Size. 66.40mm [A 66.36mm]. Replacement Parts. Rings. 53010006640. Pin. 715372. Clips. 72074. Cross reference numbers ONLY. Piston (Std) UR RED 1P8-11631-00-A0. Piston (Std) UR ORANGE 1P8-11631-00-B0. Piston (Std) UR PURPLE 1P8-11631-00-D0. Piston (Std) UR GREEN 1P8-11631-00-C0. Piston Ring Set (Std) 5CU-11603-10-00. Pin, Piston 5UP-11633-00-00. Circlip 93450-19052-00.
- SKU
- 22591B
- Brand
- Vertex
- Availability
- In Stock (1)
FULL DESCRIPTION
Vertex Piston Kit - Single Ring
This Vertex Piston Kit is designed as a direct OEM replacement for your motorcycle. Engineered for performance and durability, this kit ensures your engine operates at its peak efficiency.
Key Features:
- Complete Kit: Includes piston, rings, wrist pin, and circlips for a full replacement.
- Heat Treated: All pistons undergo a T-5 or T-6 hardening and tempering cycle for enhanced strength and longevity.
- OEM Quality: Standard pistons and components match original equipment specifications.
- Single Ring Design: Optimized for specific engine performance.
- High-Quality Materials: Made in Italy for superior craftsmanship.
- Fitted as Standard: Used as original equipment in many motorcycles.
Specifications:
- Bore Size: 66.40mm (Nominal)
- Actual Bore Size: 66.36mm
Replacement Parts Available Separately:
- Piston Rings
- Wrist Pin
- Circlips


