aussie yammy fanatic

Hello race fans. I thought i'd introduce myself. I live on the gold coast in Australia. I have a few older Yamaha two strokes as well as a some late model 4 stroke road bikes. I recently was lucky enough to find a good example of a As1, 125cc 1967 model. I really love the bike and its performance. I also have its little brother, the Yl3 100cc 1969 model, that I'm restoring. Anyway I may have some questions and knowledge in regard to these bikes that I would like to pass around this forum. Any forum members with AS1 or yl3 bikes? I would love to find expansion chambers for the As1. Here"s a pic of the as1