Hi,
First time owner and post. I just purchased my daughter a polaris 90. It runs good, smokes a little on the heavy side, even for a 2 stroke. The seller said he always premixed gas because he did not trust the oil injection system. Is there anyway to tell if the oil injection is working properly other than monitoring the level? I am going to continue premixing for now, to be on the safe side. What ratio should I mix to?

Thanks in advance for any help!