If you blow in the fuel inlet with the carb upright it should blow right through, when the carb upside down the float valve will be closed and you will not be able to blow through the inlet. That’s basically how I check them.
But, sometimes they will leaky slowly and it’s hard to tell, all you can do is clean the seat the best you can and replace the float needle, if that doesn’t fix it then the carb is junk.
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But, sometimes they will leaky slowly and it’s hard to tell, all you can do is clean the seat the best you can and replace the float needle, if that doesn’t fix it then the carb is junk.
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