Oh, that's good starting point for a great project. My bike is very similar to yours, but someone put on a scrub brake. Will you please post close-up pics of the lower frame tubes from the engine plate back to the axle hole? I need to create caliper mount on the clutch side (I've got correct caliper for it), and I'd sure like to know how far it's supposed to look. Someone told me that my bike originally had a 2-spd trans, and that the mounts for it were used to hold the scrub brake. I'n not going to try to find a 2-spd trans, but I would sure like to put a caliper on it. Thx!
BTW, I was told you cannot tell the model year from the serial #?