Just picked up a 2002 Sportsman 700 today. The previous owner stated he had replaced the front diff cage and bearings along with a tune up. It needs the boot between the air box and carb replaced too. So far I've run into an issue with the 4WD not engaging. The light in the switch lights up but thats about all I can tell is happening. The speedo lights up, reads the correct gear and toggles through hours and miles with no problem. Of course the P.O. didn't have any manuals so still trying to figure out the different settings in the speedometer too. As far as the 4WD, is there a good way to test if the right front speed sensor is working or if there is a way to test the wires to the front diff? Other things to check while I'm in there?