Hi Everyone, my name is Carn. Hoping to get some help on my GY6 buggy engine.

I have just purchased an Adly/motoroma GK125 single seat buggy for my grandson, I want to do some upgrades but not sure what kind of engine it is. I’m led to believe it is a GY6, to be honest these scooter engines look all the same to me. For some reason mine doesn’t have the usual QMI numbers, mine says CT125. Can anyone enlighten me as to what this means. Thanks.