Ok I will try to explain were this cap is. This is on a 2nd generation 2003 rsv If you are setting on the bike it would be on the right hand side behind the horn on the back of the motor, look in the space between the exhaust pipe and the oil filler cap on the clutch cover,you will see it. I can find no reference to this in the manual . They say the tranny is lubed from the motor oil ,Iam wondering if it is a gear lube bath?