I just bought an 07 WR450. Love the bike! For the last three years, I rode a KX250, and I never used the clutch lever to change gears. I never had a clutch issue, or a break down due to not using the lever. Now that I've invested a nice chunk of change on the 450 I want to get some other opinions or history from some of you on the lever. Is it smarter to use it, or just a waste of time.