I've got a 1989 evo engined FXRS with wet clutch and 5 speed transmission. There's oil coming out of the outer primary chaincase cover where the transmission shift lever shaft enters through the inspection hatch (the hatch held on by 4 bolts). Is there some sort of bush, oil seal or o ring in there? if so is it easy to replace, my Clymer manual just doesn't seem to cover it.