I have a 1986 Honda Fourtrax 250 that I have been trying hard to get running. It had been sitting for many years. I removed the carb, cleaned and installed a Moose rebuild kit. It began to flood from overflow on carb almost immediately after turning on gas. I have tried polishing the needle seat with brasso and q-tip and have the seat very well cleaned and polished. I also experimented with the original needle and the aftermarket- no difference. Checked float- it is floating.

Am I missing anything? Any suggestions?

Thanks so much.
Josh