I found this site after my key broke (yeah, don't leave it in the steering lock when you move the bike - lesson learned), and as there was plenty of quality info, here's my contribution. Anyway, after running around Melbourne trying to find a replacement spare (Went to a run of the mill key cutter, Scoota Vita (Brunswick), FX Powersports (Brunswick again, who are supposed to be a dealer of Sachs), Peter Stevens in the city (who, in yet another display of awesome and consistent customer service referred me to a locksmith), and finally a locksmith in Hardware Lane. He took one look at my remaining key, 30 seconds and $11 later, I had a spare that worked properly. So, in order to save you a good 2 days of running around, here's the key code that works for Sachs Express: TOY4R Yes, that's it. While the key looks a little plain, it works.