CRF125 420 Chain Conversion Kit

Drop rotating weight and put more usable power to the ground with our 420 Chain Conversion Kit for the Honda CRF125F and CRF125FB.

Designed as a lightweight performance upgrade over the factory drivetrain, our 420 conversion kit delivers an impressive 42% weight savings, reducing rotating mass for quicker response and a lighter, more responsive feel. Self cleaning mud grooves help keep the sprockets clean and reduce wear.

We’ve also increased the rear sprocket size to improve low-end acceleration and holeshot performance, making the bike more responsive where it matters most.

Kit Includes:

• Lightweight CNC machined 7075 aluminum rear sprocket 
• High-strength CNC machined 20CrMnTi shot-blasted 13T front sprocket
• Premium KMC 420 pitch extended length gold-plated chain 

Gearing:

• CRF125F Small Wheel — 50T rear sprocket (stock 46T)
• CRF125FB Big Wheel — 53T rear sprocket (stock 49T)

Fitment:

• 2014 - Current Honda CRF125F
• 2014 - Current Honda CRF125FB

Pair it with a set of Titanium Sprocket bolts to further increase weight savings. A complete drivetrain upgrade built to wake up your CRF125. 

Less rotating mass. Better acceleration. More usable power.

***NOTE: MUST BE USED AS A COMPLETE KIT. WILL NOT WORK WITH OEM 428 SPROCKETS OR CHAIN.