Being honest, most of us could pick holes in that.
What it essentially distils down to is often, "How long will my new bike last if I don't maintain it properly?"
Beyond the first service, done by a dealer, subsequent services in a bike's early life have to be done to maintain warranty. Warranty on mainstream Chinese bikes is better now (thanks to the likes of Lexmoto and Sinnis) but considering the initial cost of the bike, and the fact that most Chinese bikes have shorter service intervals, a lot of new owners don't bother"the bike was £1000 cheaper but it costs £300 more for services!" The percentage of Chinese bikes that don't get properly maintained is greater. The stage at which maintenance stops is generally lower.
(this is why you see more Peugeot V-Clics than Baotians. They were the same scooter but Peugeot dealers charged a premium and tied buyers into at least a year of having their serviced properly. Baotian didn't.)
Answering the question concerning something like an older CG125 or Honda C90, bought new, was that if not maintained after its initial warranty period, it wouldn't last for ever. A lot of us will testify to this, having seen the results. It will last longer than most new Chinese bikes treated in the same way, though. The general build quality is better. That is undeniable.
(The Jinlun we had was slightly less "nice," than the Honda Rebel it was based upon, which we also had. On a direct comparison basis if we'd stopped maintaining both bikes at the same point, the Honda would probably have lasted longer.And when I say, "maintaining," all we ever did was change the oil regularly, and maintain/change the chain.)
A bike not maintained at least to the extent of changing the oil, changing/maintaining the chain/belt, keeping salt water and crap away from the fork seals etc won't last indefinitely. A Chinese branded bike will undoubtedly last less long than one made under the auspices of a major brand like Honda, Yamaha etc. By contrast maintain something properly and it will reward you with many years of service, even a Chinese moped.
(Harking back to the Jinlun again. When we owned it there was a thriving owners forum. This was mostly enthusiastic, sprinkled with the inevitable, "These bikes are sh!t, mine turned to cheese overnight!" posting. Whenever photos were posted of these problems, it was evident in most cases that the bikes had not been maintained. For example, sagging chains, red with rust. When the bike has a centrestand, the chain needs only a brush with some engine oil regularly, a new one is £6 delivered, and it's 10 minutes to change it, what's the chances of those same bikes having a regular oil change?)
In conclusion, buy a Honda, stop maintaining it after its warranty period and it will last you a while before it eventually dies. It will die, but probably not early on. Buy a Sinnis, stop maintaining it after you've worked out the cost of servicing to maintain the warranty (making it less cheap than it originally looked) and it will die sooner than the Honda.
