Yes, I have a 2005 sportsman 500HO, and I think it was called the "CDI box" under the handle bars can cause fires. I went to the dealer and they replace them for free. The new model is a bit larger it seems, with larger heat sinks. That is the only issue I have had now in 1700 miles on the quad using it in the summer and winter for plowing. My drive belt is starting to make some noise, I plan to replace it this spring with my normal maintance procedure I do every spring.
The once who dies with the most toys, wins. I am only missing an airplane