Flying Horse 2-Stroke/4-Stroke Motorized Bicycle Engine 415 Chain Master Link &ndash; Gas Bike Master Chain Link The 415 Chain Master Link will replace that old, busted 415 chain's master link on your heavy duty motorized bike chain Installation couldn't be easier: with a chain breaker, remove your old master link. In the open ports, slide the new master link's pegs through and then the link cover plate over them on the opposite side. Slide the locking plate on to both pegs of the master link, and you're ready to ride Note: 415 master links will only work on 415 chains, and are not compatible with 410 chains