Been away racing in Luxembourg so sorry for not replying sooner
There's 2 versions of the clutch, on road and off road, make sure you get the right one

(the off road has 4mm holes in the shoes, the on road has 6mm)
In off road, they start to engage at approx 8500rpm and have a shorter slip range being fully engaged at around 9500/10000rpm.
The clutches last for years if they're used correctly to start with when they're new. Try and avoid a wet meeting the first time they're used
Ian