hey mate under n.s.w laws it must be clearly visible and readable at a 45 degree arc of the motorcycles centre line at a distance of at least 20 metres and its an offence to alter number plates in any way including bending them.
hope this helps mate
if ya can't afford fines - don't do it !
I thought that new law as of 1st jan 2013 in nsw that any vehicle under 3 ton didn't need a rego sicker on and as my car didn't get one when we renewed it I feburary I took mine off the bike and been pulled for rbt a few times nothing has been said by the boys in blue
sorry been on the road for 14 hrs did not read it right