SnoEast & Killer
The 900's had both 30mm & 32mm
as far as the 34mm taper goes we reverse engineered the taper and checked it in .025 increments came up with a solid degree number and cut taper and it didn't fit worth a chit..... so we just kept tweeking it until we got a nice full contact patch fit from start till end.
after torquing the clutch it has a nice crisp snap when you pull it.
We checked several new clutches and all fit nice with a good snap,
we had the same problem when we made the new balancer mandrel.
So that being said I would rather not mention a taper #, reverse engineered clutch tapers are tricky. ( taper fits on clutches are rarely a cut and dry number. )
But once you get it dialed in on your specific machine then the machined tapers fit nice.
Sense we don't have a print from the factory Nor are we cutting them on the exact same machine with the same tooling....( it gets tricky )
The clutches are pretty damn hard and do not machine very easy.
My guess is the factory grinds both the crank taper & the clutch bore ( but that's just a guess )
The reason indy Specialty bought a CNC Lathe is because clutches we had machined in the past rarely seem to fit correctly.
Dan