[Tamir]

IF you feel

Yes but more than a "feeling" it is a matter of measurement:
1. You can check the ruler at the manufacturer label near to the control window?

2. You can check the slack (20-30mm), and if the slack is not constant (when turning the chain), at such a level that the manufacturer's requirement(20-30mm) can not be set, then the chain should be *replaced too.

*It is recommended to replace the whole set: Chain + Sprockets

REF: HONDA CBR250R/RA OWNER'S MANUAL P.63 - P.66

 

[Tamir]

running with not proper maintained chain chance to effect performance of bike and gear shifting also become very harder.

YES and...
If the chain falls off the sprocket, or if the chain is torn, then in addition:

• Great damage may be caused to the engine
• It is possible to lose control on the motorcycle (An Accident) ☠💀☠

 

[DannoXYZ]

Or you can lose a leg as chain flies off under full-throttle!

Make sure you set chain tension and feel that it's correct.