Look, everybody knows...
Reliability and engine lifespan generally:
China 3yrs tops
Some japs 20 years (ct110, z50 etc) but generally not that long.
But look at it this way, i could buy a pitpro and a year later it would only lose 500 bux yet a jap bike such as a yz over a year may lose 2 grand value...
The worst are crf50's...People buy it for like 2.5k or something, spend atleast 5k with frame mods, bore kits, exhausts, graphics etc. and then only sell it for like 3 or 4k
So they lose around 3k.....
If i was gonna buy a 250 or a reliable trail bike such as a crf150 or ttr, of course i'd get a jap but china's are cheap and fun. If you spend the right amount, it will also last!
Cheers.