anyone using this combo? with any success?

Lots of people are running cat secondary. With lots of success. Fett Brothers has the shaft for $135. Give 'em a call.

I think the recent snow tech had a piece on cat clutches on zx chasis sleds.Just glanced through the mag but i think it's in there. http://www.snowmobileworld.com/forums/iB_html/non-cgi/emoticons/biggrin.gif

I have a Cat sec in my 99 MX6. *I had it machined by Hitech (machined spline into clutch). *It is also equipped with the ER kit and a straight 47 helix. *Yoiu will have to move your engine over some. *I have a Sled Pro alignment tool and moved the engine over the equivalent of three thick and one thin AC clutch shims (sec spacers from AC dealer). *I am also running HC`s. *Seems to work well although I am still working on final calibration. *should have all ready this weekend.