I do this to all kits, especially after I replace the chains with #40 roller, but I had this problem several times even with stock chain sizes so be aware some kits need this done. Sone do not. If the chain sticks on the front sprocket, you should break the corners. I had one recently that stuck so hard it made popping sounds as each link was forced in and out of the teeth.I dremelled the square corners off of the teeth to allow the chain to roll off of the sprocket smoother. Just break the edge a little and you can file it if you don't have a dremel.
I'm pretty sure it's next to the tinfoil gum wrapper factory. They use the leftover gum wrappers to make chinese stock kit chains. :0Yeah, check the chain alignment (front and rear sprockets must be in line and on the same plane so there is no torsion on the chain), and check chain tension. I had the same problem recently and it was chain alignment. I am using 415 chain, which came stock from the undisclosed location of the Chinese bike chain factory.