Oilfilter:
As milton mentioned for the X2 also the X5 filter is a steel mesh filter. Thats why I accepted the cleaning. They blew it dry with compressed air. Maybe X2 and X5 even use the same filter type. I try to figure that out.

EDIT:
checked TaoBao just now. Its the same / same type of filter. Not exactly sure for the dimension

X2 oil filter.jpg

Speed:
Until now i come up to 95 to 100 km/h top speed (speedo indicator, real might be 110 already, see my info regarding speedo) because I still limit the revs. But there is more to go. One Chinese rider i met in the shop said the X5 would be faster then a JH600. I must challenge Barry in drag racing

For the gear problem I will be at the shop tomorrow to see a Shineray Company mechanic. The shop owner said already if the problem is not to solve by adjustment tomorrow I will get a new bike. Fair enough.