I am looking at a very nice 1969 Tr6 Tiger, and have a few questions, please: How do I tell the difference in a tr6c and tr6r, if both have low pipes on them? Also,What is the flow difference between a single 69' Tr6r Amal, and the two on a Bonnie? I know the Bonnie had hotter cams and higher compression, but was the Tiger single carb much bigger than each of the the twins on the Bonnie? Was there really much seat-of-the-pants performance difference other than top end speed, between the Tiger and Bonnie of that year? Thanks!