This may not even be an issue but I need to be sure before I muck something up. When I have the Centrifugal clutch installed on the shaft, there is room for it to slide in and/or out on the shaft. Do I need to shim that somehow so it cannot slide back and forth or just install the key and shaft bolt and let it ride? Or is the play designed so it can ride and find it's perfect place in line with the chain? Also, before I cut adjustment grooves in the engine mounting plate, how tight should this chain be? Been awhile since I've even messed with a bike but I'm thinking no slop at all yet not cranked down so thight it's hard to turn. Is there a simple way to gauge that? 415 chain setup on a hybrid trike (front hub 1000w) w/rubber spoke mount and small 3hp (79cc) predator 4 stroke engine because the gas engine is mainly a back up. . Thanks for your help.