125cc atv chain coming off

[J0SH122]

So I’ve got a 125cc atv and I’ve tightened the chain where it has little slack and it shouldn’t come off.I thought it was the front sprocket so I changed it but it still fell off.So I checked the carrier bearings and they have little play on them but it’s like literally nothing.One thing I did notice was the Hubs where loose could this cause this.Also every time the chain is going to come off I hear like this clunking noise.Any help is appreciated Thanks