The Trail 90 was called the CT90 from the early 60s until about 1968,
then the CT200, basically the same bike. I don't know the last year
for those. There were apparently Trail 50s and Trail 70s as well,
but I never saw them in the Honda literature of the day, so maybe
they weren't released in the US. I expect the model continued for
many years in non-US markets.
I'm selling parts from a CT90 I bought on eBay about 10 years ago. It
was one of to bad eBay purchases. It turned over and the engine
looked good, but it was otherwise basically a hunk of junk. I
recently had the bright idea of stripping it and selling the parts,
and that's working well so far, even parts that are rough. I may
eventually get my purchase price back.
Prices on eBay seem to be high for the Trail 90s, $1200 minimum for a
nice one, and sometimes almost double that. There are quite a few
that come up, more than most other Honda models from the 60s and 70s.
Dallas
1970-73 C70 Honda Service Manual: http://tinyurl.com/6ebwtw
1970-73 C70 Troubleshooting Guide:
http://tinyurl.com/6ebwtw (scroll to sec.7.1 page 101.jpg)
1980-83 C70 Honda Service Manual: http://tinyurl.com/hu42c
1980-81 C70 Troubleshooting Guide:
http://tinyurl.com/hu42c (scroll to sec.18-1 page 170.jpg)
1982-83 C70 Troubleshooting Guide:
http://tinyurl.com/hu42c (scroll to sec. 20-28 page 205.jpg)
1980-81 C70 Maintenance Schedule: http://tinyurl.com/z4zn6
1982-83 C70 Maintenance Schedule: http://tinyurl.com/hw35c
More resources for C70 Passports and Cubs:
http://www.shlaes.com/Vehicles/Scooter.htm
http://www.velodrome.com/HondaC70/HondaC70.html