Mx523 said:
Are they well-built bikes? Any known problems with them? I'm talking about from 1998-2005 years also. Thanks.
2001 and past they are excellent machines,In 2001 they had a little problem with a lifter arm engaging the powervalve, i think, but it is most likely fixed on any 01 rm125 hat was well taken care of so it shouldn't be an issue. They had the problem fixed in the 02 model.
for the avg rider all of the recent japanese125's are good and 2003 and past KTM's are good. But when which one is best it really comes down to rider preference. your best bet is to get the one with the best local dealer support.