looks like a mini RC/C
So all the engine parts from the 125ccm Gileras from that time will fit.
So first we will have to make shure which engine is mounted.
Power valve cover clear plastics.... electronic
Power valve solid aluminium... pneumatic.
With that information you may find parts at the electronical bay from other gileras.
I think the Sioux is also included in the workshop manuals of the 125ccm Gileras.
Have a look at the members area here around.
It looks like the Sioux is rather rare. So keep it an enjoy
<edit> uupsss.... 50ccm?
The 125 seems to be another indian. Apache.
Sorry
ciao Joachim