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Alpha-4E posted on r/dirtbikes1w
https://www.amazon.com/KTM-Chain-Gauge-Tool-Black/dp/B0FBTCVGM2 I use one on my Husky. It keeps me from over tightening the chain which was my tendency. It’s amazing how little a chain will stretch if it’s adjusted correctly. Tusk makes a cheaper version for $5. https://youtu.be/knQfUQtxvAY?is=rPCZcIkkTsyqxOnl Go to :50 second mark to see how to use it to check chain slack. I’m pretty sure your manual will show you measure chain slack on your KTM on top of the swingarm just aft of the chain slider and not from the bottom.