I wanted a Honda but could only afford a Kazuma and was told it's a Honda motor so if any Honda owners know of a solution to my problem, please let me know.

I have an Kazuma 50 that we bought a xmas gift for my 7 yr old son. He rides only in our level yard and grass pasture. The thing has broken four carb joints right across the left bottom bolt since then and I can not figure it out. The motor mounts all seem tight. Please tell me what else I can check, he loves the atv and it runs great when the intake isn't broken. Please advise if you have heard of this condition. Thanks