I have a Troy-Bilt portable generator (Model 01919) with a Briggs and Stratton engine (model 204412, Type 0163-E1) using a NIKKI carburetor. Problem: will not start. I checked the oil levels (OK), replaced with fresh fuel, check spark plug (no fuel on it) but still no luck. I removed the carburetor fuel bowl and dropped the float assemble. Bowl was half full of fuel. Cleaned (really no issue) and replaced the float assembly and bowl with a spring between the bottom of the float assembly and bowl (I guess, since the spring was in the bottom of the bowl when I removed). Engine started right away, running low and high revs, and ran for about 5 minutes then stopped. Fuel was dripping from the air breather intake. Repeated the above process but would not start. I'm not sure if the float assembly must go in a certain orientation relative to the underside of the carburetor. The bottom of the carburetor has little holes as does the top of the float assemble - the top of the assembly is a round plastic disk with the same diameter as the bottom of the carburetor. Any help? THANKS

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Check and make sure the orings are tight t,turn the carb unside down and see if float is level.

I have a Troy - Bilt 5500 portable generator. Where can I buy a new carburater for the generator

Replacing the carb will only solve your problem for the time being. If you let the generator sit, it will happen again. You should buy a Nikki carburetor repair kit from B&S and install it after you soak the complete carb in Gunk carb cleaner in a sealed jar. This will remove the invisible varnish that has coated the orifices inside. In the future, turn "off" the fuel and let the engine to stop due to fuel starvation. Don't use the kill switch!! This is the only way to prevent varnish deposits from prolonged storage. Change the plug and oil once a year, check the governor spring and idle screw tension spring for corrosion and replace as necessary, and remove the cowling that has the kill switch on it, then the pull cord cowling, and check the magneto coil and magnet rotor for corrosion. Use a light grade sand paper to lightly remove any surface rust off the magnet rotor and then remove the magneto and lightly sand its face too. Readjust the gap to 0.012 in with a feeler gauge and put everything back together. Should crank right up.