I regularly wonder how one of the better quality Chinese 250Fs would compare to an XR or TTR250 for a similar price. The few tests the bike mags have done on the Chinese bikes have (deliberately?) gone nowhere near the question.
The local bike shop has sold a few better quality pit bikes (brand forgotten). There's a CRF based one with 17/14" wheels there ATM and it presents as a sensible/realistic bike.
In contrast, there's an old pit bike there for repair, and the difference is glaring.
It is very refreshing to see people with a positive attitude towards the Chinese bikes. The time has definitely arrived with the product coming in absolute leaps and bounds over the last few years.
I purchased my first Chinese ?mini" about 6 months back, paid less than $800 delivered to Tas and that was after a middleman in Melbourne was involved.
After hearing about quality issue in the past I wasn't expecting a lot here, however 90% of the bike is seriously impressive. The motor is fantastic, however I was smart enough to re grease swing arm bearings, head stock, put proper oil in the motor and take care of some minor things still forgotten about by them.
Nathan, I highlighted your post as someone on the miniriders forum has done what you proposed here. Buying a cheap air cooled Chinese 250, made a few minor improvements then ended up with a bike which goes as well - or better than an XR/TT 250 for less than $2,000.
The main negatives were the forks, so a set of second hand WR forks were purchased for $350 or so, the rest of the front end benefited too. The carby was swapped and a minor mod done on the rear muffler, the rear shock tweaked and he ended up with what appears to be a very reliable, yet very fun and capable machine.
Things may get tricky when China start entering the higher performance market as the tolerances and need for higher quality parts on the highly tuned race 4 strokes (CRF, YZF etc) is obvious. At this stage though I think they have no problem churning out nice and reliable, lowly stressed machines though, which are probably a hell of a lot more fun in the end anyway.