you can use lucas fourstroke oil
No
Soy
Depends on the manufacturer as to what type and weight oil to use.
10w-30 advanced synthetic motorcycle oil
20W-40 is best - Yamalube
1.13 liters
realease the old oil and then use the oil that you want to use make shure to use thin oil in the colder monthes and thick in the summer
That depends on what you are using it for. Obviously, if you are dirt biking, you should use a dirt bike, and otherwise use a street bike. Start out with what you are going to use the most - dirt (freestyle) or street racing.
If the bike is a 2 cycle then use nothing but a name brand 2 cycle oil of your choice. If the bike is a 4 cycle then use SAE 10w30 any major brand full synthetic.
for a bike the ratio is usually 32:1. I mix it right in the gas can. I use 20l exactly of gas and put in 625ml of mixing oil.
Motorex, SAE 15W-50