Last week I managed to get my wheels trued by a pro-shop in Sydney by the name of Chivo's.
I am running aluminium 36 hole pro-wheel motocross rims that I had powder-coated gloss black. The front hub is the standard XS650 unit, whilst the rear brake and hub is from a 1973 TX750 (larger diameter than XS650 rear setup).
Prior to dropping them off I discovered a problem that I was facing on the rear, with the dimple and hole directions being slightly off what they need to be to suit the angle of the spokes. Once they were being tightened too far, they started bending the spokes. The head of the nipples also didn't seat well within the dimples.
Thankfully Doug Chivas had a solution which included, shortening and re-rolling new threads for the rear spokes, larger nipples and re-lacing in a 1 Cross pattern.
I also got some larger matching nipples for the front rim too.