This is a Yaban gold non o'ring 520 chain 156 links. This chain will work with any sprocket combination on a swing arm that is +10 to +12 in length. It is a high tensile strength chain that we had custom made to fit drag banshees with extended swingarms. Non o'ring chains make 1-2 more H.P. at the rear wheel compared to an o'ring chain because they have less drag . This is why most drag banshees use non o'ring chains.
This is not two chains linked together with two master links it is a one piece one master link chain. We have tested this chain on engine sizes all the way up to 10mil stroker motors (cub cylinders 68 x 64) making 120H.P. at the rear wheel with no issues. If you have an engine larger than a 10mil motor of any kind we can not guarantee the life of the chain since we have not tested it ourselves on larger engines. We also recommend with extended swingarms the use of a spring tensioned chain roller as this will help limit the amount of chain flex during hard accelerations.