maybe he trapped a fuel pipe whislt sorting the oil leak ? if it was a timing cover then he must have removed the Tank, that is were I would be looking,

 

Check your battery connections. I had a similar problem when I bought my bike a 2 years ago. I was freaking out cause it happened a day after I bought it. I brought it to a shop and they ran a diagnostic and 3 weeks and $110 later they told me it was a loose connection at the battery terminals

 

Thanks I'll ask him about that.

lol damn, and yeah I tightened the battery connections but it's still sputtering and dying.