Hello..... I have a 05 Sportman 800 EFI that is not locking into 4 wheel drive. When the 2 x 2 to 4 x 4 switch is activated the gauge will show the 4 wheels as in 4 wheel drive however the front wheels will not engage. Whether in High or low gear. I placed the machine on blocks engaged the 4 wheel drive and the drive shaft coming from the engine foward is not turning the rear is working fine. In fact the bike runs excellent short of this issue. I am under the impression from research there is some sort of soleniod in the front differential that may be bad. Please advise as to how to repair so that I can eliminate the laughter from my buddies when I get stuck! Thanks!