it's not too bad if they're pre 1989, but later models can be difficult. I'm assuming that Sumoto would get around it by holding an import licence and being able to comply the bikes themselves. Costs a good couple of grand, but the more you do, the cheaper it gets. Notice they only stick to a few models? I'm suspect that they bought Otobai Imports (who hold the licence to do TZR's) - or at the very least have a cosy relationship. It was moved down to Melbourne close to them recently.