honorable mentions:

BoiBoicleetus69‘a GC-50
The builder decided to leave the challenge. A great kart nevertheless.

Hellosss38‘s
This kart is really great! Good handling and detail but sadly it did not meet requirements.

Third place:

JaeBeansS’s The Golden Ship of Atlantic.
This is by far the most creative build I’ve seen so far! Good job JaeBeansS!

Second place:

AtomicCyclone‘s MB-01
This is a very realistic looking kart!
Can clearly distinguish the motor. I think it is an ~80cc 2 Stroke motor. Good job AtomicCyclone!

First place:

TakicraftCorporation‘s TW Junior Champion Kart!
Everything on this Kart I feel like I can pull out of my phone and use it on a real go cart it’s very unique Kart In the backstory was pretty cool to add, Good job TakicraftCorporation!

Thanks for entering in the go kart challenge!