If you happen to run a "friction modified oil" on accident, or in an emergency, you'll be shocked to see what happens....a big, fat nothing. It works. I've had to do this in many, many bikes and did it before I knew it would not work. This Hinson fellow also said it was no big deal...Ron something.....Yes, this leaves room open for the guy who did it and his penis fell off.....But seriously, if it did nto slip in my 2 stroke yz 300 putting out 60 hp through a clutch no larger than a softball..you're ok in most motorcycles. 99% of the clutch slip stories are from a friend of a friend's grandmothers lover.