Just recently purchased a FZS1000 2004 (23K) and during riding there is weepage at the oil filler cap. At first, I thought a gasket had failed as the oil was collecting under the clutch cover. I have tightened the oil filler cap as tight as it will go and still she weeps. I was thinking maybe a quick fix by using a few layers of PTFE (plumber's tape) as it does offer good heat resistance. Is this an inherent issue or is it something unique and an indicator of a deeper problem?