Hot Rods Bottom End Kit - OEM Crankshaft Replacement – 1990-2007 Honda CR125

Is your Honda CR125R losing its punch? A tired bottom end doesn't just rob you of horsepower; it puts your entire engine at risk of a catastrophic failure. The Hot Rods Bottom End Kit is the ultimate Racing Performance solution for riders looking to restore that crisp, high-revving power. Moto-House MX provides this all-in-one package to take the guesswork out of your rebuild, ensuring every internal component works in perfect harmony.

Every Hot Rods crankshaft in this kit is factory-assembled and precision-trued to OEM specifications, meeting or exceeding the tolerances of your original equipment. Built for maximum Durability, the kit features a heavy-duty Hot Rods connecting rod and premium main bearings and seals designed for high-RPM reliability. To ensure a leak-free seal and peak primary compression, we include a complete engine gasket set, making this the most comprehensive rebuild solution available for the legendary CR125 platform.

Top Features: Hot Rods Bottom End Kit

• Precision-Trued Crankshaft: Factory-assembled to meet or exceed OEM tolerances for vibration-free performance.
• Heavy-Duty Connecting Rod: Engineered for superior strength and longevity under racing conditions.
• High-Speed Main Bearings: Premium-grade bearings and seals for reduced friction and improved reliability.
• Full Gasket Set: Includes all necessary gaskets and seals for a complete engine overhaul (water pump seal sold separately).
• Fully Rebuildable: Unlike some disposable units, this crankshaft can be rebuilt using genuine Hot Rods rods in the future.

Fitment List

Year Range	Vehicle Brand	Vehicle Model & Size
2005-2007	Honda	CR125R (CBK0022)
2004	Honda	CR125R (CBK0021)
2003	Honda	CR125R (CBK0020)
2001-2002	Honda	CR125R (CBK0019)
1998-1999	Honda	CR125R (CBK0018)
1990-1997	Honda	CR125R (CBK0089)

Frequently Asked Questions

Is the crankshaft ready to install out of the box?
Yes, the Hot Rods crankshaft comes factory-assembled and precision-trued. However, we always recommend verifying the crank's true before installation to ensure nothing shifted during shipping.

Does this kit include the top-end piston?
No, this is a Bottom End Kit focusing on the crankshaft, main bearings, and full gasket set. We recommend pairing this with a Vertex or Wiseco piston kit for a complete engine refresh.

Why is the water pump seal not included?
While the kit includes a comprehensive engine gasket set, the water pump seal is often considered a separate service item. We stock these at Moto-House MX if you'd like to add one to your order.

Upgrade Your Ride with the industry leader in crankshaft technology from Moto-House MX.

Moto-House MX – Choice of Champions – is located in Clermont/Montverde, FL. The best motocross shop in Central Florida.

Click to see all the other performance upgrades for your Honda CR125R