I have a 2000 yz426 that I bought about 8 months ago, and I ride mostly tight trails in oregon and washington. I have read about all the good upgrades on Thumpertalk and was planning on doing most of them to make the bike better on trails. That included the weighted flywheel, 01 clutch upgrade, Dr D hot start, changing sprokets and a number of other ones I had read about. I was just waiting to get some extra money. I then talked to the guys at D&S cycle in aloha and they said they had great results with the rekluse and they said it would take care of the problems I was having with stalling,the clutch and trying to restart the bike using the hot start on hills and trails. I had them install the the rekluse pro which they had not installed before and they said it was alot easier to install than the original Z start and had better parts and easier adjustments. I have to tell you after two trips to the woods this is the best thing ever you can go anywhere and not worry about tight areas, hills, roots, rocks, ruts, sudden braking your bike never stalls. You can go slow as you want and still goose it and have all of the 426 power. Sorry for the long post but I wanted people to know you don't need all of the other mods because the rekluse takes care of all of the problems. The only time I had to start my bike is when I unloaded it and if I turned it off to look at a map.