I rode 300kms with 2 stroke oil in my 4 stroke bike... how bad will the damage be? This sound is coming from my engine

https://v.redd.it/5h4zbl88u2331 via /r/motorcycles https://www.reddit.com/r/motorcycles/comments/by53kk/i_rode_300kms_with_2_stroke_oil_in_my_4_stroke/?utm_source=ifttt