’96 Trx90 problems…help?

Hey all I’ve been beating my head against the wall over this little quad, its first problem was a bent exhaust valve do to a fault compression release well I fixed the valve and removed the comp. release….

It had been sitting for bout 6 years so I gave it the tank n carb cleanse as per required, well one pull and it fires right up and purrs like a baby Honda

Problem? It runs good for about 5 minutes then it seems to flood and die

Do you think there could still be crap getting into the carb?