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Low compression one day, high compression the next

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I was riding my 05 kx250f the other day and when i was starting it it had noticeably less compression than the weeks before that, with it being an 05 i assumed a valve was out of spec, i started it and rode it up to my garage on the way up i could tell that it lost some compression because it had nowhere near as much power as before. So i parked it over night and when i went out the next day i tried kicking it over with my hand slowly to see how bad it was and surprisingly it was back around its usual amount of compression and was pretty hard to turn over when the day before that i could literally turn it over with 2 fingers. If anyone has any ideas as to what this could be id love to hear them. I haven't started it since the night it had low compression.

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may have had some dirt or carbon stopping the valve from closing fully 

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