Oh I remember that sound. I had the 1984 A1. When it started it sounded like the proverbial "bag of spanners". But on the move ...... some say big motorbikes roar or howl. Mine didn't, it yelled and what it yelled was, "Get out the f...ing way". I miss it so.
Cool, I had an all original 1984 red GPZ1100 fuel injected for a number of years not too long ago, my regular rider, bike was great and comfortable. I always loved these designs, great looking bikes. I forgot, I had a red 750gpz for a couple years back around 2000.