Yz400

Ok I'm posting for a friend don't know much about his bike. He bought the bike and it was backfiring and would bog after about an hour of riding he started it up after a brief stop and it caught on fire he ripped the side number plate off and threw dirt on air filter to put it out we later found it. It still runs but has occasionaly squirts out of carb onto air filter how does that happen? He took carb apart and lost the screw that holds the float to the whole assembly so it's currently not working but what could be the issue with the back firing bogging and gas squirting out of carb onto filter? Guy before him just put two brothers complete exhaust on with out jetting it that could be back firing issue I think but let me know

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