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You need something to break the old chain. I prefer an angle grinder with a cutting wheel (cuts through chains like butter). If you go this route, remember to lay down rags or padding to protect your swingarm/frame.
Assuming your chain is already the proper length, you’ll need a rivet tool to press the new chain’s master link into place. If you have a clip-style master link, you’ll need only a pair of needle nose pliars, and possibly a small c-clamp.
As well as sockets etc, you will need a chain splitter/rivetter see :
Just done my bandit.
You will also need to replace the sprockets, they are designed to have a lifespan roughly equal to a chain (as long as you have been lubricating it regularly). If, for whatever reason you are not replacing the sprockets you can use the old chain to lead the new chain into position, which is convenient.
If the sprockets are worn not replacing them too will wear out a new chain pretty fast. Check them by feeling the edges of the teeth.If they feel sharp or the tips are curling over they need to be changed.It’s almost always wise to replace them as a set for longer life.A good o ring chain is worth the extra money they cost too.They sell chain breakers or you can take an angle grinder and grind the head off a rivet and the use a pin punch and hammer to drive the pin out.I always use a master link and the old chain to feed the new chain through the countershaft sprocket.I’ve never had any trouble using a master link instead of riveting the new chain.Just make sure you put the closed end of the master link clip in the direction the chain runs.You’ll need some tools to adjust the chain tension.Make sure you get the alignment right by sighting down the chain from the rear of the bike.