Hi Kiwipom
I have had a similar belt drive on my A10 for the past 3 years. Mine was from Sean Hawker
Quieter and cleaner it is, and the up-gearing is of real benefit to me running 12V, with a DVR2
I found it was essential to have a small seal fitted behind the large pulley to prevent oil seepage which otherwise caused belt slippage
I have gone through a few belts to date, but I do run with a Boyer ignition and a 45W headlight (LED's elsewhere). The belt does needs to be tight and needs a re-tension now and then. I reckon on a few thousand miles per belt, and always carry a spare
In retrospect a toothed timing belt like the SRM may have been a better choice for me (the perceived risk of shock load damage minimal?), or I reckon that a poly V belt would be ideal for the application ????
Cheers
Mike