The manual says 50-60 mm of slack measured from the upper slider bolt to the the bottom of the chain with the rear wheel off the ground. This is the procedure I have been following and I have been running exactly 50mm of slack which measures to 3 fingers worth. The issue is that my chain looks excessively loose when under weight and I'm getting tons of chain slap. Even a couple riding buddies "KTM guys" have commented how loose my chain looked. What are you all running for slack?