Do you use the same chain and add / subtract from it?
Or
Do you have a chain for each gearing ratio?
Thanks fellow karting prophets
Most times, for small changes, we keep the same chain and move the engine.
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When it comes to chains and sprockets, it’s believed that worn components can accelerate the wear of others. For instance, if you whack a ratty, used chain on a new sprocket, it’ll wear down that sprocket’s nice new teeth much faster than a new chain - and vice versa. I’d try keep everything equal in condition.
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Generally you’ll have a chain length that works for a given range of gears for you, adjusting the tension with the fire/aft position of the engine. Which, I’m afraid to say can be one of the bains of working on a GoKart 
So if you’re running just one track, or at least tracks with very similar gearing you’ll use the same chain length.
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If you really need to change a chain length, you can use a chain breaker to remove or add links.
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Once its not an o-ring chain that is