Motorcycle Questions? Ask a Mechanic.
Hi and welcome to JustAnswer,Thank you for the question and your patience. Should you still need assistance for information purposes only...Initially, bear with us; re-confirm and post back with the complete model number of the "...chinese made go kart..."
Have you tried starting it with the brake levers pulled in?
Still, and if have not been tried; inspect the battery & ground lines and/or check/clean the battery cables + terminals as a preliminary consideration. Better yet, have the battery externally charged and then LOAD TESTed (even if new and just for the purpose of eliminating it as a suspect).
Appreciate the post back Tony.
If there is fuel and there is spark, then 2 other factors to consider:
Propose to have a compression check or better yet, a leak-down test.