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1995 polaris sport 400 2stroke,run at a idle,went about 500 ft n it acts like it ran out of gas.The fuel filter is about a quarter of the way with gas.It went from wide open running great to running like it was out of gas.
 

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If it has a drain screw on the bottom of the carby, turn off the fuel tap, loosen the screw and watch the fuel draining out, when it ends turn the fuel tap on again and it should flow at near as fast as it had been.. or a good enough amount at least to keep the bike running.

If it doesn't run out the bottom at a fair rate, then you have a fuel supply problem.. So next you pull the fuel hose off the carby and check the fuel flow through there..
 
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