[sweatmachine]

There is some loud valvetrain noise, but what you're describing sounds like something more.

Where was the oil leak? Oil leaks at the valve cover are fairly common and not a big deal.

If something is definately wrong then they should absolutely replace the bike, but ask them if it's valvetrain noise. Normal valve noise sounds almost like a coffee can full of nuts and bolts being shaken, but quieter.

 

[sweatmachine]

all are common, get a new gas cap, check the valve clearances, RTV the valve cover gasket and yer done!