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OMB Warehouse has the largest stocks of 40 41 420 go kart chain all sourced from the leading brands around the world for assured strength and durability. Here is what you need to know about 40 vs 41 vs 420 go kart chain and the difference between 40 41 and 420 go kart chain. The 40 41 420 go kart chain all have a ½ in pitch. The go kart 420 chain is the most used out of these three and is not as wide from side plate to side plate as the go kart 40 chain thereby preventing touching against the driven pulley or frame if it is in a tight fit. The go kart 420 chain has more strength than the 41 chain as the side plates are taller. The go kart 40 chain is the sturdiest in its class and moves smoothly with thicker sprockets as there is more room between the side plates. The go kart 41 chain looks just like the go kart 420 chain but stands shorter. Never adjust your sprocket, axle, or engine position because you have a particular chain size. Instead, buy a chain that suits your sprocket configuration.