I built this BSA Goldstar a couple of years ago, they are really interesting machines. This one had the best of everything including an ABSAF crank set up, an RRT2 gearbox,etc. I never even rode the thing.
I have had five Goldstars over the years and I think they are one of the top motorcycles ever built. You could set them up to road race, scramble or just ride down the road.
