If it's 110 it's bore should be at least 52mm.
If it's 100 then it's bore is 49-50mm.
If it's 78 that is 88cc then it's bore is 47-48mm.
Most paki bikes are under stated in registrations papers. I saw one hero prince 125 mentioned as 100cc I'm papers.
Don't worry for papers.
Also don't ride at that low speed
Run it at least 50-70kmph. It's oil pump works best at high rpm. I installed 0 number ring piston cylinder and did my running at full throttle speed. No issue at all.
Don't try to resolve these pesky little issues in the beginning let them be for a while then address it afterwards.
Don't reply on mechanics negative stance about these Chinese bikes. These are the best bang for the bucks.
They bash it because their parts are not available at every ship so they can't make you a gahk.
They have no scientific knowledge. No testing if these chondaz. So their criticism is unqualified. And take it with a grain of salt.
