I have had troubles with my 800 sportsman since the day I bought it. If it isn't the speed sensor it's the instrument cluster. What has kept me with the polaris is that, when running right, it will run circles around the Grizzly's and Arctic Cats I ride with. My issue I am faced with now is with the battery. I just replaced it a month ago and hadn't started it since (extremely cold and not on my tender). After I hooked it back to the tender and let it get a good charge (showing 13.5) I turn the key and nothing. Normally I see the instrument cluster come on but now...nothing? I am ok at tearing these things down but not an expert so any advice anyone can give I would greatly appreciate it!