1. Put your scooter on central stand and on a flat ground.
2. Remove black plastic dipstick (close to exhaust).
3. Undo a screw at the bottom of the engine 17 mm (beneath plastic dipstick). Be carefull, oil is going to drain !!!
4. Remove this screw but be carefull because there is a spring inside. Remove this spring also.
5. Remove oil filter screen (a small oval shaped metal net). Clean this screen with compressed air or with gasoline and let it dry.
6. Undo a golden coloured screw at the other side of the engine 17 mm (variator side). Some more oil is going to drain !!!
7. Screw back golden screw to its place.
8. Put oil screen filter and spring back to nut and screw back to its position (under the black dipstick at the bottom of the engine).
9. Pour fresh oil into a hole where black plastic dipstic is (exhaust side). Do not put more than 0.5l at once and put some more while checking dipstick. Do not exceed max mark !!!
10. Put back black dipstick and start the engine for 10 min. Check oil level again after that. Be sure you put back everything as it was before !!!
Good luck and write back what you did