Im new to pitbikes and this page and i need help with YX 160 engine out of a Atomic Avenger

[Matty Dirtrdr]

Hi I'm new to pit bikes but definitely not new to motorbikes, all the main manufactures cannot help with any problems as they say they don't deal with cheap bikes so someone told me about this site so thought I'd give it a go.... I've never used one of these forums so forgive me if I put this comment in the wrong section..
***********QUESTION************
On most other bikes I own the oil site glass has a low and high marker next to it or has a dipstick connected to the cap but the Atomic doesn't have any... Does the site glass need to be completely full or only half?? I wasn't able to get a oil filter so I just left it for now and I'll change that soon enough,