Wiseco GP Series Piston Kit with Gaskets - Honda CR125R (2003) - 56.00mm Bore (+2.00mm BIG BORE) - 134cc - Nikasil - 2-Stroke Race-Spec

Wiseco GP Series Piston Kit with Gaskets - Honda CR125R (2003) - BIG BORE

The Wiseco GP Series represents the pinnacle of 2-stroke piston technology for the Honda CR125R. This is a BIG BORE kit (+2.00mm) that increases displacement from 125cc to 134cc - giving your CR125R serious power gains with GP Series race-spec features!

🔥 BIG BORE: 125cc → 134cc (+7.2%!)

This +2.00mm big bore kit provides a 9cc displacement increase - that's 7.2% more displacement for noticeably improved power throughout the rev range!

⚠️ Important: Installation Requirements

• Sleeving or Replating Required - Cylinder must be bored to 56.00mm
• Fits Nikasil bore cylinder only
• Piston does not have an intake window
• Pinned on centerline
• Longer skirt than stock (improved stability)

🏁 GP Series Race-Spec Features

• Electra Coating - Crown, ring groove(s), and pin bores coated for maximum wear resistance
• ArmorGlide® Skirt Coating - Protection from micro-welding, galling, and detonation
• Extra Lightening Operations - Enhanced throttle response
• Made in USA - Engineered, forged, and machined in the USA

Kit Includes

• Wiseco GP Series Piston - Premium 4032 aluminum alloy with Electra + ArmorGlide®
• Ring Set
• Wrist Pin
• Circlips
• Wrist Pin Bearing
• Top End Gasket Set

Key Features

• GP Series design for professional-level racing performance
• 4032 aluminum alloy construction - optimized for 2-stroke applications
• Dual coating system - Electra + ArmorGlide® for ultimate protection
• Designed for endurance and sustained RPM riding
• Complete top-end gasket kit included
• Wrist pin bearing included - everything for a complete rebuild
• Longer skirt design for improved stability

Displacement Increase

• Stock Bore: 54.00mm = 125cc
• Big Bore: 56.00mm = 134cc (+7.2% displacement!)

Important Notes

• Sleeving or replating required - cylinder must be bored to 56.00mm
• Fits Nikasil bore cylinder only
• No intake window design
• Centerline pin location
• Wiseco ring types are not interchangeable
• Wiseco pistons can be fitted only with Wiseco rings

Piston Specifications

• Bore Size: 56.00 mm (+2.00mm Big Bore)
• Piston Diameter: 55.94 mm
• Stroke Length: 54.50 mm
• Material: 4032 Aluminum Alloy
• Skirt Coating: ArmorGlide® + Electra
• Style: GP Series

Engine Specifications

• Displacement: 134cc (up from 125cc)
• Engine Type: 2-Stroke
• Weight: 0.75 lbs

Fitment

• Honda CR125R: 2003

Year-Specific Fitment

This kit is specifically designed for the 2003 Honda CR125R with Nikasil bore cylinder. Honda changed piston specifications between model years - verify your cylinder type before ordering.

Why Choose the Big Bore?

The +2.00mm big bore conversion combined with GP Series race technology gives your CR125R the ultimate competitive advantage for open class racing!