Wiseco 3937XS Series Replacement Piston Ring Set (100.00mm Bore)

Restore your engine's compression, sealing power, and efficiency with this premium replacement piston ring set from Wiseco. Precision engineered to meet rigorous performance standards, this series features advanced material compositions designed to thrive under intense heat and high-RPM environments. Wiseco rings deliver exceptional oil control and minimum friction for long-lasting, race-proven durability.

⚠️ CRITICAL NOTICE — SIZE & FITMENT SPECIFICITY: Piston components are highly specific to exact bore sizes. You MUST accurately measure your cylinder to confirm bore sizing and verify your piston dome stamp before ordering. Return requests cannot be accepted for opened engine components due to improper sizing.

Features & Benefits:

• Wiseco Exclusive Design: Engineered strictly as a direct replacement ring package for Wiseco pistons. (Note: Only Wiseco replacement ring sets may be used on Wiseco pistons).
• Advanced Cylinder Compatibility: Optimized for use in cast iron, nickel ceramic plating (Nikasil), boron composite, and Electrofusion bores. (Caution: Not for use in chrome-plated bores).
• Precise XS-Series Engineering: Features a high-tolerance profile configuration that matches the unique ring groove dimensions stamped on your Wiseco piston dome.
• Superior Oil Control: Provides exceptional sealing capabilities to minimize blow-by, stabilize compression, and optimize heat transfer from the piston to the cylinder wall.

Important Fitment Notes:

• Includes one complete ring set for one piston.
• Ring styles cannot be interchanged; please refer to the ring type stamped on the dome of your existing piston to ensure an exact configuration match.

Fits: 

ATV & UTV Models

• Suzuki QuadRacer 450 (LT-R450 / LT-R450Z): 2006 – 2011

• Yamaha Grizzly 660 4x4 (YFM660F): 2002 – 2008

• Yamaha Raptor 660R (YFM660R): 2001 – 2005

Motorcycle Models

• Honda RC51 / RVT1000R: 2000 – 2006

• Honda XR650L: 1993 – 2025

• Honda XR650R: 2000 – 2007

Personal Watercraft (PWC) Models

• Sea-Doo RXP 155 / 215: 2004 – 2009

• Sea-Doo RXP-X 155 / 255: 2008 – 2012

• Sea-Doo RXT 155 / 215 / 255 / 260: 2005 – 2012

• Sea-Doo RXT-X 155 / 255 / 260: 2008 – 2012

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Please note: We ship to the lower 48 states only. We do not ship to Alaska, Hawaii, Guam, or Puerto Rico.