I purchased an 07 King Quad 450. I have only 180 miles on it and think that I am starting to have problems with the 4 wheel drive. Lately, when it is just in regular 4-wheel drive I noticed that the front wheels don't spin as fast as the rear. Also, I noticed the front end jumping around like the 4-wheel drive isnt "engaging" all the way. Not sure. Is this something I should be concerned with? I have also noticed when I lock the front differential in whether I am in H or L, if feels like the engine is missing or something. (kinda like when you ride in reverse (4x4) without the override button pushed in.) What is the deal with this? I have read the forums about the air filter problem, and thought about changing mine out. I know that this won't help with the 4 wheel drive problem, but might help out when I have the differential locked.
I noticed the problem the most when I ride in the snow. I can't remember if I had the same problem or not during the summer months. Can someone help me out and see if I have a problem that someone else might be having or its just the conditions I have been riding in. The quad is still under warranty for a few months so I should be able to get it fixed if there is a problem.

 

Put jackstands under the rear a arms, and see if it will pull itself off while parked in the snow. if the 4x4 works it should. if you can get a front wheel off the ground at the same time while it is locked it would pull itself off as well.

 

The front end is jumping up and down because you get traction and then you dont and then you do again. The engine cutting out sound is normal with diff lock you have to hold the overide button in. There is nothing wrong with your quad. Mine does the same thing in snow but it doesnt in mud or sand. I have the same wheeler if theres something wrong with yours theres something wromg with mine and all my buddies quads then to

 

In reply to your message. Shouldn't the front end spin the same speed or a little faster than the rear end when in 4 wheel drive?