use the lighter gear oil and the web sights says to use only 300ml of gear oil to add 3-5 mph on the scoot. they sd that 500ml is to much and causes drag in the gears. using 300ml will run great and protect as well as 500ml good luck
the oil pump well kind of pump is over saturating the plug. best way to fix this is to bypass the oil line (block it) and premix oil and fuel and run that way. good luck