KTM Sportmotorcycle — Reduced acceleration

Address:

39/1 KP mondal road 1st lane budge budge, South 24 parganas kol - 700137

Hello, currently i am riding a rc 200 bs4 model. My bike is 3years old, ridden approximately 13000 kms. Well maintained having smooth performance throughout.

I am facing a strange issue with my bike, when i take out the bike from the garage for a ride it is smooth in the beginning like for 15-20mins, but after that, the bike smoothness slowly diminishes and it really becomes difficult to accelerate, the vibrations increases significantly. It feels i have to accelerate more to obtain the desired speed. The more i ride the more resistance in acceleration. If i switch off the bike and ride it after half an hour, my bike is smooth again but for like 15mins, after that i feel the same problem. I have changed my engine oil. Motul 7100 100% synthetic nd also changed the clutch plates. I am still having this issue. Please help