Vertex VTK22189B Top End Piston Kit Cast Replica 1992-1997 Honda CR125R 53.94mm

Vertex VTK22189B Top End Piston Kit — 1992-1997 Honda CR125R

Product Description

Is your vintage two-stroke losing its compression and throttle response? Restore the track-shredding performance of your legendary machine with the Vertex VTK22189B Top End Piston Kit. Engineered specifically for the 1992-1997 Honda CR125R, this complete top-end refresh kit eliminates the guesswork of sourcing individual parts, providing a matched, heavy-duty solution that solves common compression loss and cylinder wear issues. Vertex pistons are trusted by professional racers and engine builders worldwide for their precise tolerances and factory-level performance restoration.

Every Vertex Cast Replica piston is constructed from a high-grade gravity-cast aluminum alloy utilizing an 18% silicone content. This advanced material composition drastically reduces thermal expansion, allowing for tighter piston-to-wall clearances and reduced skirt friction. To optimize durability right out of the box, the piston skirt features a factory-applied high-tech Molybdenum Disulphite coating. This coating speeds up initial break-in times and provides critical protection against premature wear, ensuring your CR125R runs crisper, hits harder, and lasts longer between service intervals.

Top Features: Vertex Top End Piston Kit

• Cast OE Replacement: Precision gravity-cast aluminum alloy replica piston containing 18% silicone content to minimize thermal expansion and maintain consistent engine tight tolerances.
• Moly-Coated Skirts: Advanced Molybdenum Disulphite skirt coating facilitates faster engine break-in performance and significantly increases overall piston life.
• Thermal Hardening: Piston structure undergo a specialized T-5 hardening and tempering heat-treatment cycle for exceptional structural strength and durability under load.
• Complete Top End Package: Includes the cast replica piston, premium rings, wrist pin, circlips, complete top-end gaskets, and a heavy-duty wrist pin bearing.
• Color/Finish: Natural aluminum finish with a dark grey high-tech dry-film lubricant coating applied directly to the piston skirts.

Please review the detailed application guide below to confirm exact model and year range compatibility with your motorcycle before purchasing.

Fitment List

Year Range	Vehicle Brand	Vehicle Model & Sub-Model
1992 - 1997	Honda	CR125R (2-Stroke)

Frequently Asked Questions

Q: What components are included in this kit?
A: This complete kit includes: a premium Vertex Cast Replica Piston, high-performance piston rings, wrist pin, secure circlips, a complete top end gasket set, and a high-durability replacement wrist pin bearing.

Q: Is this a cast or a forged piston assembly?
A: This is a gravity-cast aluminum alloy piston, designed to match the factory OE style and performance of your original engine specifications with enhanced silicone for lower thermal expansion.

Expert Pro-Tip: When performing a top-end rebuild on a vintage 2-stroke like the CR125R, always measure your cylinder bore with a dial bore gauge to ensure it is within specification before installing the new 53.94mm piston. Don't forget to thoroughly clean the exhaust power valve assembly of carbon deposits while the cylinder is off, and pre-lubricate the new wrist pin bearing with high-quality 2-stroke oil during installation to prevent a dry start.

Recommended Pairings:

• Shop Additional Honda CR125R Parts
• Shop Premium 2-Stroke Premix Oils
• Shop Factory Replacement NGK Spark Plugs

Moto-House MX
Your Premier Motocross & Powersports Specialist
Serving Clermont, Montverde, and the Greater Central Florida Area
Available for Fast Shipping Nationwide or Convenient In-Store Pickup.