I was recently at the track at my 675R and on downshifts my rear wheel was locking up even with a yoyodyne slipper clutch, the slipper is new and got better when i rev matched but this should not be the case.
This is normal if you just dump the clutch, especially at higher RPMs. If you're good at rev-matching while braking, you should still do that. With the slipper you don't have to be all that precise.
Were you at njmp two weeks ago? There was another 675 that was locking up his tire, smoking all over the place. A coach ran up to me as I pulled in and asked if it was me. I guess we had similar looking bikes?
I will look into that, as it's not a case of the slipper being installed incorrectly a race shop installed the clutch and they have done alot of work on other race bikes for me a zero issues.
I'd say take the bike back and have them look at it again. There's something not right there. I've got a yoyodyne slipper in mine and I've never had the rear wheel lock up in 3 years of racing the bike.
I would also say that you need to work on your down shifting even with a slipper. It's not a best practice to just count on a slipper to compensate for your downshifting. I rarely have my slipper kick in during a down shift.
Since you are in NJ, you might want to consider doing a YCRS class.
Yes, the slipper should disengage on each and every downshift on the 675. I even feel mine on basic street downshifts. It's not something that only happens at a certain pace. It is pretty much fool proof too. There is virtually no way to lock the rear or over rev on downshifts with a true ramp and ball type slipper. it simply disengages the plates until road speed matches engine speed. It's pretty much the best thing since sliced bread. The 675 sees a MASSIVE benefit from this piece due to it's very busy nature on the brakes.
One thing I didn't think of earlier, but remembered now because I'm going to change mine... the Yoyodyne comes with two sets of springs. One set results in less slipper action, one results in more. From what I remember of testing both sets when I first installed the clutch, there is a significant difference between the two.
Correction to my above post now that I'm actually pulling the clutch cover off... the Yoyodyne comes with two sets of spring buckets, not springs. I think the red ones result in more slip/less engine braking.
Make sure the two spacers are not utilized from the stock clutch(one is flat, the other is slightly convex). That could be your stack height issue.
The other would be to change to the other spring washers(you should have received a red and silver set with the slipper)
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