Just wondering if there is a definite difference between R5k and R6k frame numbers (or frames).
The NSR-World specs page seems to show frame numbers matching the models.

http://www.nsr-world.com/specs/html/nsr250/index.htm

For example, it seems to imply that
The R2J and R4J frame numbers are MC18-100xxxx
The R5k and 5k-II frame numbers are MC18-110xxxx
The R6k frame numbers are MC18-120xxxx

I have recently come across what appears to be a legit R6k bike with frame number MC18-110xxxx, and so am wondering how reliable this numbering system is. This particular bike has the Magtek rims, the dry clutch engine and the SP shocks front and rear.
OK, maybe someone has replaced the frame on this particular R6k, but it would seem unlikely. Also, is there any actual difference between a frame marked 110xxxx and one marked 120xxxx?

Also, (and I aplogise) I haven't bothered to search the forum too much on this one as it is seems difficult narrow down with keywords, but what is the difference between an R5k and an R5k-II?
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[color=#808080][size=9]Yes,.. I too know how to waste Time and Money,...

Tuck this is your frame number that came from the SP machine

Geezagillard PM'ed me with a link to this thread:

http://www.nsr250.net/forums/viewtopic.php?p=47573&sid=91accea606a76d7ab950041b5af9fcd9

which states the following:

Page 2 on the MC16 MC18 Parts guide lists engine & frame numbers. I expect the same detail will be in other parts guides.

It would be great to add this info to the specs pages

Model___________ Engine no range________ Frame no range
--------------------- ------------------------------ ----------------------------
NSR250RG (MC16) MC16E-1000047~1021049 MC16-1000033~1020966
NSR250R2J ______ MC16E-1031032~1058121 MC18-1000020~1026996
NSR250R4J ______ MC16E-1039597~1051877 MC18-1008557~1020796
NSR250R5K _____ MC16E-1130033~1149562 MC18-1100017~1119489
NSR250R5K-II ___ MC16E-1130033~1149562 MC18-1100017~1119489
NSR250R6K _____ MC16E-1130054~1148151 MC18-1100038~1118089
NSR250R6K-II ___ MC16E-1130054~1148151 MC18-1100038~1118089

However, this has massive overlap between models and doesn't even mention MC18-120xxxx numbers at all. So where does the MC18-120xxxx designation come from? Anybody?
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[color=#808080][size=9]Yes,.. I too know how to waste Time and Money,...