I had trouble starting my '06 WR450 (w/ all free mods) twice on a ride yesterday. The bike fired right up (with the starter) in the brisk morning air. I let it idle for a few minutes, then shut it off because we weren't ready to go. Upon attempting to restart a few minutes later, it didn't want to go at all--not even a sputter. I did not use the choke nor the hot start at first--it seemed warmed up, but only barely. I finally got the engine going after nearly draining the battery and resorting to lots of kicking. Using the choke and/or hot start didn't seem to help. What finally did it was me holding the throttle wide open. (I realize this is a no-no on a thumper, but I was desperate--and it worked.) I was able to start the bike immediately the rest of the day (using the hot start) with one exception when I stalled on a muddy up hill and ended up having to do the kick/full throttle thing to get it going. For what it's worth, when cranking it with the starter both times I had the trouble, it acted like the battery was dead for a moment--by reseting the computer--but then engaged and kept cranking fine for quite some time. What could be going on? In case it's relevant, I posted information about recent maintenance I had done, but thought the problem had gone away.