Hi I got a 86 230 quadsport bored 0.40 over and it is burning oil out the exhaust pipe And dont kno y could u plz give me a couple hints on y it is doing this plz and ty

 

Your quad should not be burning any oil. If you have smoke coming from your exhaust it's time for new rings or a top end rebuild. If the smoke only comes out for a bit after start up after its been sitting it could be valve seals. You may have to take it somewhere to get it correctly narrowed down to which it is.