RK 219 Racing Kart Chain
RK Japan Co. LTD. Was formed back in 1951 and was known as the Takasago Chain CO. LTD. Later it formed as the Takasago Manufacturing CO,. LTD. Both Companies were merged back in 1991 to form RK Excel Co. LTD. Head Office located in Japan with a huge distribution network across the globe. Their main market is the motorcycle chain industry, both in the commercial & racing division. When compared with other karting chain manufactures they are the same size, structure, global distribution as the DID Chain Company.
The RK Karting Chain has been around for a long time and they have many different types of kart chains, such as the RK Blue 219 O-Ring Kart Racing Chain, RK Green 219 Kart Racing Chain, RK Gold 219 Kart Racing Chain. The RK Green Kart Chain is non O-Ring chain, which is not widely sold in all countries. The two famaous chains that RK offers in the karting industry are the RK Blue 219 O-Ring Kart Chain & RK Gold 219 Kart Chain. The difference between the two is the Blue chain has an o-ring and the Gold Chain is non o-ring chain. The difference between the o-ring and non o-ring chain is the non o-chain ring chain requires much more lubricatuion and once the inner bearing surfaces (roller pin) will overheat, kink, cause severe drag, and ultimately stretch/fail, where as, the RK 'O' Ring chains prevent this from happening by continuously lubricating and protecting critical internal bearing surfaces. Therefore prolonging the life of the Kart chain. In other words the o-ring chains helps retain the lubrictaion in between the roller pin and main pin area. The only thing is with the o-ring chains is that itís great for classes like the Tag, KF2, KF1. Where motors have lots of bottom end torque and horspower because when using a O-ring chain you will have a slight loss of HP by about 0.3 HP.
When looking at the chain you can see itís simular to the DID Kart Chain except for the outside plate neck size is much lager than other chains like DID, EK, & KTI. Which provides added strenght to the chain, but sacrificing slightly rolling effiecency. The material used on the RK chains is simular to the DID but itís not nicely finished as the DID kart Chain. You can see that the DID Chain goes through extra steps to perfectly complete each part made on the chain. Not to say that the RK chain is inferior to the DID or other chains. We feel that the RK 219 Kart Chain is a better chain than the DID Kart Chain, because of a robust inner core. Hereís why:
- RK has a Thicker inner side plates than the DID
- RK has a slightly bigger diameter rollers than the DID
- RK has a slighly bigger & harder Pin than the DID
All this combined helps the core structure of the Kart Chain, and with the proper material used helps prevent the chain from streching or over heating which in turns contributes to retaining horsepower.
We have had much success in the past with the RK 219 Kart Chain, both o-ring and non o-ring chains and we clearly would recommend these chains in all karting classes as they will provide superior durability and consistancy thorughout each session or outing. We feel that these chains are better the DID kart chains and this is based on over 2 decades of experience and testing.