Mike its interesting you dont get any chatter through your clutch lever. Myself and a few others with STMs have all had that.:headscratYep that is what you need. I think most people are happy with std 140KG spring. This is the exact clutch i have in my 07 YZ450. The add say 03-06 but it can be used with the 07-09 also if you use the clutch pak from the 03-06 which is basically the steel plates from the 06 plus 1 extra fiber. As far as feel mine operates identical to the stock clutch I get no chatter what so ever. It simply works as it is suppose to and eliminates rear wheel chatter/hop when downshifting quick on corner entry. The only difference from the stock clutch is at very low RPM if you stall you will feel it "click" through the lever and disengage then stall. Not an issue at all and actually makes the bike harder to stall if you have that issue. Looks in decent shape and all there. You might even be able to grind him a bit on the price.
because the clutch is doing the slipping so you get some feedback through the clutch actuation rod, through the cable and to the lever.A little confused..... I thought the slipper clutch stopped/reduced wheel chatter. How do you feel it through the lever?