Hey i bought a CM400 in several months back and I am having a couple issues - I need a back tire, my chain is sagging a lot, I need a new head light casing, there is a clicking noise coming from I think the cyllinder, and one of my muffler had a second plate welded on an extended baffle that has blown off - and this is messing up my back pressure and I am not sure if I am damaging the bike by still riding... any suggestions