The tensioner that APE sells is really manual. There is no spring and you set tension a bit differently than on earlier Kaw OEM manual tensioners which ALSO work in your bike. These come off a Z1, Z1A, Z1B and KZ900 (76/77). There might be other manual (from other Kaw models) tensioners out there that will work. In any case, these tensioners rely on a spring loaded push rod. You load the spring initially by pushing it all the way in and lock it. There is a lock bolt on the side which catches the flat side of the rod... Install the tensioner (two bolts/gasket) and then back the lock bolt out a bit and the spring will pop the rod out and the rod pushes the tensioning piece in the engine. This type tensioner works better than an "automatic" tensioner in my opinion but you need to be careful when using one. After tension is set (the rod releases internally), there is a locknut on the lock bolt that needs to be tightened to hold the lock bolt from moving or backing out. FIRST, you need to inspect the innards to ensure that the raised part on the rod hasn't scored the inside to where it can hang. Also, the rod has a flat pad on the end and if you get it a bit sideways when released, it will sometimes not want to pop out cleanly. You MUST hear a solid thunk when releasing it or pull it off and reload it and try again.