so, i recently got an 86 200x. tore the side cover off to check out the internals and it seemed to be in alright condition. the one thing i noticed was the chain that drives the oil pump is very loose. so much slack that it could possibly touch the case and shows signs of slight wear to the case. could the chain just be worn and stretched? is this a common thing to run into? thanks for any help. wanna clear this up before i waste a gasket and put it back together. matt