kick start return spring could be bent and hanging on something. Pull the RH covers and have a good look to see if anything could be binding up the ratchet gear or idler gear. If it's not there then it's possible you have a more serious problem in the business end of the motor.
If your bike is a modern day thumper (4 stroke), if the engine just happens to rotate past the decompressor and stops, you are trying to kick against full compression. If the bike runs fine, does not smoke, does not knock, and has no lack of power, you have nothing to worry about. As far as the person with the lawnmower that does that, check the flywheel key. It may be partially sheared.
When the kick starter "freezes", rock it back and forth, then it works, sure sounds like a clutch issue to me. The clutch is not engaging completely for some reason, and the kick starter can feel froze. Are you sure there is free play at the perch? Then I would look for a loose or worn clutch, especially a notched basket and/or inner hub. I suppose even warped metals could do it? What is a XY125, got any pics? Vintage Bob
I owned a "thumper" a couple of decades ago. (A thumper is a single piston engine, usually large-ish, mostly 500cc) I had a Suzuki SP370. It had a. . . pressure release. . . that allowed the engine to turn without compression. When you saw silver (metal) in the window on the side of the engine, it was ready to kick start.
I only used this when the bike was new. It turned out that my engine stopped at the perfect spot.
I have read that many thumpers have a problem with "kick back", though I never saw it.
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