I have been checking out the threads on the Rekluse z-start clutch and searched other sites as well. Everyone seems to sing praises for this clutch in the "tight woods sections" and in the "tricky technical stuff" or "tight cornering". What I do not see is the "balls to the wall" desert riding. We are talking high dunes , soft sand, long rutted tracks, high temperatures, low speed in sucking sand and high speed runs. A lot of work for a clutch and a lot of spinning wheels, until you get "on top" of the sand. Surely the guys on the Dakar rally, or the Baja 1000 would be looking at these clutches if they were so good? (...maybe they do?) It reminds me of the synthetic oil adverts on TV , absolutely fool proof!, ride your car with no oil! , freeeze your engine and start it first time!!, doesn't burn at high temperatures etc.. etc...... how come you do not see the Formula 1 Racers using these oils or any other racers of note for that matter... makes you think doesn't it. Has anyone tested these clutches out in these kinds of conditions and would anyone recomend or condem these clutches. How robust are they and what would their "life expectancy" be? Maybe these are as good a product as all seem to say... I don't know...it just seems too good to be true... you know ..."paid advertising" ...!!! I need some good candid, and honest reponse so I can make an educated decision to buy or not to buy. By the way I have a 2004 XR650R and love it!!! Best desert bike!