help needed with my xvs 125

hi im having trouble with my xvs 125 and was wondering if anybody would be able to advise. It was running fine up untill last week when it cut off and wouldnt start up again. I noticed it had a large horse shoe type split in the inlet manifold so i replaced that, still wouldnt start, i then noticed that there was no oil in the engine so i have refilled it still no joy although it did almost start. does anybody have any suggestions as to what to try next? any help appreciated