The dynamo belt drive is a good mod, especially if you are going to go 12v. One word of warning! One of the kits from a major supplier can fail due to the way in which it is fitted. The problem that I encountered with this particular piece of kit was that the dynamo pulley would not pass through the crank case opening, if it was pre-fitted to the dynamo shaft, because it was to big to do so, now this means that it is almost impossible to tighten it up. What then happened in my case, was that the pulley worked loose and fretted on the dynamo shaft. This rendered the pulley U/S. I have since bought the Hawker Electrical version and it is designed so that the pulley can be fitted to the dynamo and tightened up before the dynamo is fitted to the bike. If you are considering fitting one of these kits, here is something worth knowing. If you are unlucky enough to find that oil is getting past the idler pinion, and finding its way into the dynamo drive cavity, then Hawker Electrical can fit a seal that will resolve this problem for good. You would need to send your inner timing cover to Shaun for the job to be done, but if you suffer from this problem it can be fixed.