Budget GoKart
Aka a kenbar
So, buy some new hubs and wheels. If they are cracking, it's probably because they're old and or bad. A different engine won't fix that. And I've seen worse scoring.
It's bad enough to be burning oil and I haven't checked the oil recently either other then filling it but that video doesn't do justice of how bad it really is. You cannot see crosshatching at all anywhere in the cylinder. I'll snap a picture later I might check the Bearings too I wanna see how screwed those are.
