I have an '06 WR450F with no mods. I rode it most of the winter and all spring. Circumstance prevented me from riding during the summer. (Last time out was in June.) I certainly didn't plan on letting it sit, unused, for 4 or 5 months, but it happened. Now, it won't start. The starter cranks it over, but it shows no signs of wanting to start. The tank has plenty of gas and I've tried the petcock in both "on" and "res" positions. Before I get hosed by a mechanic, does anyone have any ideas of what the problem might be? Thanks.