Due to theCOVID 19, We are completelysold out and out of stockofall ATV's, Go Karts, and Dirt bikes from all of our manufacturers. We are expecting some arrivals on some items next couple of weeks but until then we have nothing to sell. We are looking to back in full stock come Spring 2021. 

We are very sorry for any inconvenience and hope to be back serving you soon, this has affected the entire industry! 



420 Drive Chain | RK420M | Heavy Duty Racing chain

420 Drive Chain | RK420M | Heavy Duty Racing chain

5.0 average, based on 1 reviews


Product Code: RK420M-2

Product Information


 Premium Replacement RK Brand 420M Chain (Choose your Length)

  • Made in Japan
  • A= 12mm / .54"
  • B= 7.6mm / .30"
  • C= 6.7mm / .26"



  • (1) Custom Length Drive Chain
  • (1) Connecting Link

Choose your size:

  • Use the Provided Diagram to help determine the number of links you will need.
  • Total number of links will include a connecting link as 1 link.
  • Choose you total number of links from the drop down menu below.

Product Features:

  • All RK chains are pre-stressed and pre-stretched to ensure equal load distribution and minimal maintenance.
  • Heat-treated medium carbon alloy steel construction.
  • All components heat-treated and shot-peened for maximum strength.
  • Two-point pin riveting and solid rollers.
  • For motorcycles up to 400cc that did not come with an O-ring or heavy-duty chain as standard equipment.
  • Wear Life Index std. as 100: 100
  • Tensile strength: 4200 lbs .
  • Disp. max cc's: Street 125cc  Dirt 125cc
  • Includes CLIP TYPE master link.

How To Order: In the drop down menu provided please specify Model. If model is not known or custom size required choose (Not sure but part should fit) Then choose link count instead.

 Known Sizes: For customer referance only (corect chain will be determinded before shipment)

  • Most 70cc 78 Links
  • Most 110cc 92 Links (Except TR)
  • Most 125cc TBD
  • Most 125cc,140cc (TR) 110 Links

Please look carefully at the pictures provided. If you have any questions regarding fitment for a specific model please call 732-991-2194 for assistance.

Customer Reviews

Average Rating: 5

Good Chain

Bought this chain as a replacement for my SR125. Much better than stock fits great.Justin (May 11 2014, 16:12 pm)

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