Anytime the primary (drive) clutch has been removed from the engine and re-torqued to spec, it is always a good idea to re-check the torque after 10 hours of operation. Why? Because of the press fit nature of the taper between the clutch and the crankshaft. This is why some models will specify first using a higher torque spec to get the clutch on the crankshaft more securely, then loosening the bolt and then re-torquing it to a lower spec.
Believe it or not, we have seen on more than one occasion where a sled will be rolling down the trail and the primary clutch actually falls off. For real. Not one of our sleds, but somebody riding with us. It is always fairly soon after the primary had been removed for servicing or re-calibration.
The exact torque spec does vary for some of the various brands and models, so check to verify you are using the proper torque spec for your exact model.