Engine 2 stroke petrol mix lubrication

Hi

Is there a way of knowing, or finding out, if the two stroke oil is being delivered from the reservoir to the carb at the right quantity with the petrol on an Aerox in its standard form

 

Looking at the plug. If the engine is not geting enough oil, the plug will be a bizarre pewter colour and no amount of upjetting will cure it. Also, you will be able to massively upjet and the motor will not react to it. It will flatly refuse to cough or splutter. It will appear to run perfectly. Bit with an 'orrible couloured plug.

 

Does this look ok?

 

Looks fine to me. Just erring on the rich side - but that's good. You have no problems.

 

Would it be better to weaken the mixture a little on the carb mixture screw, or is this best left like it is.