Dirt Rider Magazine

Greeting ALL...this is my first posting here...I had a Suzuki TC90 back in '70 when I was 15 (do the math, yep I'm a dinosaur), and it was the coolest little trail bike, I could climb just about any hill. I have been restoring vintage bikes as a hobby lately , I have a '73 Norton Commando and a '67 BSA Lightning, but that TC90 was my first bike and I loved it. So, I found a 1970 TC90 a few weeks ago, and have prepping it, prior to starting, as there was no ignition lock and no battery as found. It has good compression, and I now have the ignition lock and key for it, just awaiting a 6v battery. I found a Suzuki service manual for the bike, which is really good, but there is one area that is not covered in that manual, that I am pondering over. This bike has is 4 gears, dual range. There is no mention in the manual about adjusting the dual range actuating rod. There is a t-handle that you click into either low or high range, but the threaded actuating rod is very loose on the t-handle linkage. I would like to have the rod in the correct position before I start the bike. Anyone out there have any experience with this bike, or might know where I could ask further? Also, are there any other forums that I could check out?
Thanks