Most of the guys who bought new KTM EXC TPI 2018 having this issues with leaking 2 stroke oil. For first I was thinking I over filled my oil tank with 2 stroke oil and that is the reason why my bike wet from oil.
But after small check after washing the bike I can see small leaking from the oil tank after I removed the tank I can see where it was leaking. I contacted my KTM Dealer where I bought the bike.
From KTM Dealer I got the email, this happens because of vibrations from frame and engine. KTM Factory will produce the second version of this 2 stroke oil tank, it will be stronger and not possible to break from vibrations.
I welded plastic and then used double glue for maximum holding, I hope it will not break on another side, I need to wait now sometime to get the second version of this oil tank for my KTM EXC250 TPI 2018. After small research over the facebook and google, i found I am not the only one person having this problem. There are also guys on Husqvarna TE300i and Te250i 2 stroke 2018 models having same problems. So everybody is having this problem, and one guy said: we have 8 new bikes here, and 5 bikes have this problem.