It could be a bad speedometer. Check the connections on the bottom to make sure the are seated and tight. I'm guessing that your machine uses a Hall sensor. If so it could be that. Check out these threads.
2006 500 speedo problems
Hall sensor help
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04 Sportsman 700 efi black and silver, Big Gun Evo exhaust and tuner,3 light mod,reverse override,bar and thumb warmers,Moose pregressors,Polaris heavy duty front springs and gas shocks, Black Rock wheels,Polaris(warn) winch and plow, 2 inch receiver, Filtermag.
08 Sportsman 500 efi Browning camo, Big gun Evo exhaust and tuner,3 light mod,reverse override,bar and thumb warmers,Moose pregressors,Polaris(warn) winch, Cycle Country plow, 2 inch receiver, Black rock wheels,Filtermag
00 Magnum 325 not very HO green, rolled wrecked and rebuilt,heated grips and thumb warmer, Filtermag.
88 Yamaha Warrior 350 my first
88 Honda Foreman 350 takes care of the yard work
91 Suzuki DR 350 solves the urge to ride wheelies and catch big air
05 Kawasaki KLR 650 scratches the paved road itch
92&93 Indy 500 EFI SKSs takes care of the need to get away from home in the winter
04 Yerf Dog spiderbox buggy was supposed to be for the kids but I find I cant quit tinkering with it
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