I have a Scrambler 500. It's a great bike and I have lots of fun on it. I'm in the Midwest and over the last 24 hrs we've gotten lots of snow. I wanted to get the scrambler out to have fun with the kids but when I flip the 4x4 switch it doesn't work. It just stays in 2x4. Does anyone have any suggestions or ideas? I'm fairly capable if it requires some mechanical smarts. Thanks in advance.