u/Expensive_Breath117

I have a piaagio nrg 2013 dt ac. Last week i found an air leak in the crankshaft bearings, fixed it. Before the fix and after, for some reason it burns a lot of fuel, with a full tank i go only 50-60km. It is bone stock, except fot a polini hi speed variator, yasuni z exhaust and detestriction. What could be the problem?