I know there are many topics on chain adjustment as i have searched for and read them. Thing is i dont even understand why there is such a large diffence in slack as you move the chain. The book says 35-40mm at the tightest point i think but it seems in that case at the loosest point its over 60mm. Does this just mean the chain has had it? Also while i have your attention I also noticed when fiddling with the bike on the centre stand that when running if you hold in the clutch and engage 1st the rear wheel starts to spin. I assume thats not suppose to happen and that the clutch isnt disengaging proprerly. I tried using the adjustment on the cable but the wheel still spins at the furthest adjustment... any ideas?