
CBR150r piston damaged
So my mechanic said the piston was damage and intake and valves are hitting the piston but I asked them they don’t know why. So I would like to ask your personal experience and thoughts on this.
Because I usually ride it normally no crashes. My bike is cbr150r 13k km. I change oil every 3k km. I ride it everyday to work.
I would like to know what causes this to avoid it.