FYI- one other method that can work with some bikes is to effectively shorten the existing rear shock by drilling new mounting holes. Your KPX may already be on the "shorter" optional mounting holes (I have heard), and there may not be room for any additional shortening. But here is a full thread on the process applied to the Templar X.
https://www.chinariders.net/showthread.php?t=31860
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-2022 5 speed Templar X Orange, OEM 51T rear sprocket, 14T front sprocket
-NOS 2020 KTM 250SX (2-stroke motocross), less than 10 hours on it
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