Yamaha FZ150’s are said to be uncomfortable and sometimes suffer from overheating of the rear cylinder, and they are getting a bit old, but some people like them fine. The “Breeze” version has a more upright seating position and is said to be less uncomfortable.
“The Yamaha SR150 are fine, but half of them seem to have strange cb400 part transplants,”
This is because dickheads think they don’t look cool in standard form so they fuck about with them. Best avoided, I’d say.
“and the other half look like they are 30 years old with drum brakes in the front and rear. Not exactly confidence inspiring, much less cool.”"
Re “confidence” the new ones have drum brakes front and rear. People say they work just fine.
Re “cool” no comment. I don’t do cool (but see above under “dickheads”).
“I’m living in a large apartment building (the one on top of XinDian City office MRT) and I fear I am stuck leaving the poor thing in the street.”
A good reason to avoid anything that might be percieved by light fingered dickheads as “cool”.
If you are serious about doing your own maintenance, (it’ll generally be percieved as weird, and Taiwanese mechanics are very cheap), and you havn’t done this before, then I’d say
(A) DONT, AND (B) Get something that has at least a partly relevant workshop manual available in English. This, AFAIK, eliminates all the Yamaha candidates, and narrows the field to machines using clones of the Honda CG125 pushrod or CB125 OHC single cylinder engine i.e Kymco, (perhaps excluding the KTR), Hartford, or Sym. There are partly relevant manuals available from Clymer and Haynes for all these.
Edit: There are also free manuals available for the NSR, which has already been discussed above. This is (probably) “cool”, potentially more exiting, and almost certainly less practical and a bigger pain in the arse.
I have no manual for my Yamaha RZR, the first motorcycle I have done much work on, and the “learning by discovery” is getting tiresome (though I have been avoidably screwing up a lot too).
I would NEVER again buy something I couldn’t get a manual for, which incidentally eliminates the Toyota Zace stationwaggon I was thinking of buying.
I have a free SR150 manual in Chinese, so I would consider buying one of them.
Edit: Search or PM me if you want copies of the free manuals.