I drive Nrg Power with MHR Replica 70 ccm and Dellorto 21mm carburator. Fuel consumption is 8 liter @ 100 km (78 main jet). Now, my quastion is: do i have to modify my oil pump to obtain 2% mixture (oil / fuel) because consuption is 8 liter and not 4 liter as is it was before (when scoter was "stock").