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My 1995 polaris sportsman starts and idles fine . But when I rev it up it pops and back fires through the air box.

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Remove the air box out and check starting and running without air box.Pull out and try running with the sponge out and the box lid on.and check if still the same problem then,It sounds as though the carb has sucked something into one one or more of your jets. First i would try to drain the carb bowl. At the bottom of the carb bowl you will find a brass screw that when you loosen will drain the bowl. Give that a shot and see what happens. If this does not work you will have to remove the carb and clean it.You have to remove the jets from the carb, probe them with the proper size jet cleaners and soak the carb body in a good carb dip to break down anything stuck in the passageways in the body as well.If this is also not helping then this problem is related to cam shaft. the exhaust lobe wear out on the camshaft.

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Posted on Sep 15, 2010

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