Vertex WR101-100 Complete Engine Rebuild Kit 2005-2007 Honda CR125R

Vertex WR101-100 Complete Engine Rebuild Kit — 2005-2007 Honda CR125R

Product Description

Is your high-revving 125cc two-stroke tired, down on compression, or showing signs of lower-end bearing wear? Sourcing every single internal clip, bearing, and gasket individually can be a logistical nightmare that stalls your project. The Vertex WR101-100 Complete Engine Rebuild Kit offers the perfect solution, packaging everything you need into a convenient, heavy-duty "shop in a box." Specifically configured for the 2005-2007 Honda CR125R, this total engine kit eliminates guesswork and restores the crisp, high-RPM performance and peak throttle response your machine had when it rolled off the showroom floor.

This premium top-and-bottom-end kit brings together the finest components from the industry's leading manufacturers. The rotating assembly is anchored by a Hot Rods heavy-duty stock-stroke crankshaft, paired with their high-tolerance main bearings, complete transmission bearing set, counter balancer kit, and water pump rebuild setup. For the top end, you get a world-renowned, standard compression Vertex replica piston kit equipped with top-tier rings, wrist pin, and clips. The entire engine is sealed airtight with a comprehensive Vertex complete gasket and oil seal kit, providing absolute mechanical reliability under extreme race conditions.

Top Features: Vertex Complete Engine Rebuild Kit

• All-In-One Box Convenience: Saves hours of parts-matching by delivering almost every single moving component, bearing, seal, and gasket required for a full, professional overhaul.
• Hot Rods Heavy-Duty Crankshaft: Features an engineered stock-stroke crankshaft assembly built to withstand the demanding load and high-RPM environment of a race-bred 125cc motor.
• Vertex Standard Compression Piston: Includes a world-class, precision-machined piston kit complete with factory-spec rings, clips, and a premium wrist pin bearing for smooth power translation.
• Total Bearing & Oil Seal Sets: Comprehensively updates your entire crankcase with Hot Rods main bearings, full transmission bearings, water pump seals, and countershaft/seal kits.
• Color/Finish: Natural precision-finished steel and cast aluminum alloy internals, matched with application-specific colored rubber seals and high-durability engine gaskets.

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
2005 - 2007	Honda	CR125R (2-Stroke)

Frequently Asked Questions

Q: What components are included in this kit?
A: This complete kit includes: a heavy-duty Crankshaft, standard compression Piston Kit (piston, rings, pin, and clips), Complete Engine Gasket Kit, Oil Seal Kit, Main Bearing And Seal Kit, Water Pump Rebuild Kit, Transmission Bearing Kit, Countershaft/Seal Kit, and a high-performance Wrist Pin Bearing.

Q: Is this a big-bore or stroke-altering modification kit?
A: No. This is a factory-style replacement kit engineered to restore standard 125 cc displacement and compression using an OEM-length stock stroke crankshaft configuration.

Expert Pro-Tip: When taking apart your CR125R engine cases, never use a hammer or screwdriver directly on the aluminum case split lines, or you will cause oil leaks. Always utilize a dedicated crankcase separator tool. Additionally, take your time when checking the ring end gap inside your freshly prepared cylinder bore before installing the rings onto the Vertex piston—proper gap clearance ensures maximum compression and prevents ring binding at peak temperatures.

Recommended Pairings:

• Shop Additional Honda CR125R Parts
• Shop Premium 2-Stroke Premix Oils
• Shop Specialty Engine Pullers and Crank Case Tools

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.