I own a 03 YZ 450f, Im 40 years old 225lbs. and I only trail ride. I love the power of the bike however I find that it stalls or abrubtly shuts off often at sharp turns and when I have to slow down quickly. Really wanted the WR 450 got a great deal on the bike that I have. I love it just afraid to ride it again on technical trails and trails that are in the mountains. I have been told that the Rekluse z-start auto clutch would make the bike much more enjoyable to ride on the trails. I have also been told to get a heavier flywheel. Would getting the auto clutch solve the problem? I would love to hear any comments from those that might know what I should do.