Polaris 90 sportsman 2003 will run for ten seconds when spray starting fluid in carbuerator then shuts off what is the problem?

Answer 1

While I am not familiar with the Poaris 90 Sportsman 2003, the problem you describe is common for all internal combustion engines. The spray starting fluid is nothing more than a highly volitile fuel. The fact that your engine does run while that fuel is applied indicates that your ignition and timing system is working properly. It also demonstrates that when the starting fluid is used up the engine stops, indicating that for some reason, your engine fuel system is NOT functioning properly: FUEL IS NOT GETTING INTO THE COMBUSTION CHAMBER. There could be many causes for this. No fuel in the tank, a blocked [clogged] fuel line, the fuel tank shut-off valve is not turned on, the float valve [if your fuel system has one] is stuck in the closed position, the tiny fuel passages inside the carburator, or injection system, are blocked by "varnish" [which results from lack of use, and the fuel evaporating, leaving a residue called varnish], etc. These are but some of the possible causes. Regardless, the entire fuel delivery system needs to be analyzed by someone who fully understands the operation of the system, to determine the cause [s], and once determined, properly repaired.